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Note 10 - Share Based Payments (Details Textual) - USD ($) $ / shares in Units, Pure in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 30, 2015 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2007
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 0.7 |  | $ 0.7 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 8 months 1 day |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 150,000 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  | 0.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  | 150,000 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 0.46 | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 0.46 | $ 0 |  |
Fair Value of Restricted Stock |  |  | $ 9,000 | $ 1,225,000 |  |
Plain Vanilla Approach [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 10 years |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 469,000 | $ 392,000 |  |
The 2006 Omnibus Incentive Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  | 5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  | 2,500,000 | 3,000,000.0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 3,420,708 |  | 3,420,708 |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Estimated Forfeiture Rate |  |  |  |  | 0.00% |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 2 years |  |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |

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