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Note 12 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Share-based Compensation, Tax Charges to Additional Paid in Capital From Exercise and Vesting | $ 0 | $ 0 | $ 0 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Amortization Period (Year) |  |  | 1 year 4 months 24 days |  |
Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 106,315 | 39,084 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount, Total |  |  | $ 5,000 | $ 1,100 |
Share-Based Payment Arrangement, Expense |  |  | 1,300 | 500 |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | 4,700 |  | $ 4,700 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 3 years |  |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  |  | 12 months |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  |  | 60 months |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | 500 | 400 | $ 1,000 | 700 |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value | 0 | $ 90 | $ 0 | $ 100 |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 1,400 |  | $ 1,400 |  | $ 2,400
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 52,842 |  | 52,842 |  |
The Fourth Amended 2014 Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 1,997,750 |  | 1,997,750 |  |

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- Definition The grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Weighted average remaining amortization period for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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