Note 11 - Stock Option and Equity Incentive Plans (Details Textual)
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|
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12 Months Ended |
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Jun. 09, 2016
$ / shares
shares
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Feb. 22, 2016
USD ($)
|
Dec. 31, 2016
USD ($)
$ / shares
shares
|
Dec. 31, 2015
USD ($)
$ / shares
shares
|
Dec. 31, 2014
USD ($)
$ / shares
shares
|
Dec. 31, 2013
$ / shares
shares
|
| Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | $ |
|
|
$ 1,056,000
|
$ 1,069,000
|
$ 1,119,000
|
|
| Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $ |
|
|
$ 145,000
|
$ 356,000
|
1,219,000
|
|
| Employee and Nonemployee Stock Option [Member] |
|
|
|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
|
|
232,578
|
270,205
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |
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|
17,184
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ |
|
|
$ 700,000
|
$ 1,300,000
|
3,400,000
|
|
| Proceeds from Stock Options Exercised | $ |
|
|
$ 695,000
|
$ 394,000
|
$ 709,000
|
|
| Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation |
|
|
6,514
|
1,632
|
32,164
|
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| Shares Paid for Exercise Price of Awards |
|
|
6,514
|
1,632
|
14,931
|
|
| Shares Paid for Tax Withholding for Share Based Compensation |
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|
0
|
0
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17,233
|
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| Shares Paid for Exercise Price and Tax Withholding for Share-based Compensation, Average Market Price | $ / shares |
|
|
$ 25.50
|
$ 21.97
|
$ 25.42
|
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| Allocated Share-based Compensation Expense | $ |
|
|
$ 238,000
|
$ 282,000
|
$ 354,000
|
|
| Common Stock [Member] | Non-employee Members of Board of Directors [Member] |
|
|
|
|
|
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| Allocated Share-based Compensation Expense | $ |
|
|
$ 105,000
|
105,000
|
$ 122,000
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |
4,764
|
|
|
|
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| Share Price | $ / shares |
$ 22.02
|
|
|
|
|
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| Restricted Stock Units (RSUs) [Member] |
|
|
|
|
|
|
| Shares Paid for Tax Withholding for Share Based Compensation |
|
|
3,389
|
|
3,405
|
9,878
|
| Allocated Share-based Compensation Expense | $ |
|
|
$ 314,000
|
274,000
|
$ 237,000
|
|
| Shares Paid for Tax Withholding for Share Based Compensation Market Price | $ / shares |
|
|
$ 22.82
|
|
$ 23.15
|
$ 25.88
|
| The 2003 Incentive Plan [Member] |
|
|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |
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|
2,250,000
|
|
|
|
| Limit on Tax Deductible Compensation | $ |
|
|
$ 1,000,000
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Accumulative |
|
|
1,197,034
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |
|
|
46,065
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants |
|
|
170,000
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
|
|
83,125
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |
|
|
936,182
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Types of Equity Awards |
|
|
2
|
|
|
|
| The 2003 Incentive Plan [Member] | Common Stock [Member] | Chairman Chief Executive Officer and President [Member] |
|
|
|
|
|
|
| Allocated Share-based Compensation Expense | $ |
|
|
$ 400,000
|
$ 400,000
|
$ 400,000
|
|
| Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | $ |
|
$ 400,000
|
|
|
|
|
| Nonemployee Director Stock Incentive Plan [Member] |
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |
|
|
|
975,000
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Accumulative |
|
|
4,764
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |
|
|
131,554
|
|
|
|
| Nonemployee Director Stock Incentive Plan [Member] | Employee and Nonemployee Stock Option [Member] |
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
|
|
|
149,453
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |
|
|
|
325,810
|
|
|