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Note 12 - Equity Incentive Plan (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation, One-time Benefit for Unexpected Death of Former President |  | $ 1,800 |  |  |
Share-based Payment Arrangement, Expense | $ 2,240 |  | $ 1,443 | $ 2,033 | $ 2,829
Stock Options, PSUs and RSUs to Employees and RSUs to Non-employee Directors [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |
Performance Shares [Member] |  |  |  |  |
Performance Conditions, Business Target, Percentage of Performance Conditions Based on Achievement in Current Fiscal Year |  |  |  | 40.00% |
Performance Conditions, Financial Target, Percentage of Performance Conditions Based on Company’s Operating Results in next Fiscal Year |  |  |  | 60.00% |
Share-based Payment Arrangement, Expense | $ 300 |  |  | $ 200 |
Total Shareholder Return ("TSRs") Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 2 years 8 months 12 days |  |  |  |
Share-based Payment Arrangement, Expense | $ 200 |  |  | $ 200 |
Total Shareholder Return ("TSRs") Options [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number | 0.00% |  |  |  |
Total Shareholder Return ("TSRs") Options [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number | 150.00% |  |  |  |
Total Shareholder Return ("TSRs") Options [Member] | President and Chief Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | 104,638 |  |  |  |

X
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- Definition Represents the percentage of performance conditions based on company’s operating results in next fiscal year set as business target. + References No definition available. + Details
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