Note 7 - Share-based Compensation (Details Textual) - USD ($)
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3 Months Ended |
12 Months Ended |
Mar. 25, 2020 |
Apr. 01, 2019 |
Feb. 25, 2019 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Dec. 31, 2019 |
| Share-based Payment Arrangement, Expense |
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$ 1,113,000
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$ 531,000
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| Share-based Payment Arrangement, Option [Member] |
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| Share-based Payment Arrangement, Expense |
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61,000
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144,000
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |
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9,900,000
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |
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9,500,000
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |
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3,000,000
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1,400,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |
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$ 86,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |
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1 year 73 days
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |
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0
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0
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| Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |
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| Performance Shares [Member] | Management Performance Bonus Plan 2017 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |
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$ 5,700,000
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year) |
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1 year 255 days
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| Restricted Stock [Member] |
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| Share-based Payment Arrangement, Expense |
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$ 394,000
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255,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |
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$ 5,700,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |
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3 years 109 days
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value |
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$ 1,700,000
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2,600,000
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |
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$ 813,000
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853,000
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| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |
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175,971
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |
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$ 9.43
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| Performance-based Restricted Stock [Member] |
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| Share-based Payment Arrangement, Expense |
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$ 189,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |
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$ 571,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |
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292 days
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| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |
82,805
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |
$ 9.18
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| Performance-based Restricted Stock [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards |
0.00%
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| Performance-based Restricted Stock [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards |
125.00%
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| Performance-based Restricted Stock in Lieu of Cash [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |
34,154
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |
$ 9.18
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| Market-based Restricted Stock [Member] |
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| Share-based Payment Arrangement, Expense |
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$ 469,000
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$ 132,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |
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$ 2,600,000
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| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |
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1 year 73 days
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| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |
109,140
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29,604
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94,247
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |
78.00%
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69.00%
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |
0.00%
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0.00%
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |
0.30%
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2.50%
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| Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |
2 years
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2 years
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| Market-based Restricted Stock [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards |
0.00%
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0.00%
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| Market-based Restricted Stock [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards |
200.00%
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200.00%
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