Note 5 - Share-based Compensation Plans (Details Textual) - USD ($)
|
|
12 Months Ended |
Mar. 03, 2020 |
Dec. 25, 2021 |
Dec. 26, 2020 |
| The 2020 Equity Incentive Plan [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |
|
|
1,500,000
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |
|
1,149,500
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |
|
630,400
|
318,250
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |
|
258,000
|
119,000
|
| Share-based Payment Arrangement, Expense |
|
$ 174,124
|
$ 117,842
|
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |
|
$ 383,606
|
|
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |
|
2 years 4 months 28 days
|
|
| The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |
10 years
|
|
|
| The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |
5 years
|
|
|
| The 2009 Stock Incentive Plan [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |
|
488,900
|
|