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Note 13 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Share-based Compensation, Tax Charges to Additional Paid in Capital From Exercise and Vesting | $ 0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Amortization Period (Year) |  |  | 1 year 2 months 12 days |  |
Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 103,957 | 53,584 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount, Total |  |  | $ 4,900 | $ 1,700 |
Share-Based Payment Arrangement, Expense |  |  | $ 1,900 | 900 |
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, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | 3,900 |  | $ 3,900 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 10 months 24 days |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | 300 | $ 700 | $ 1,300 | 1,400 |
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 | $ 2,100 |  | $ 3,200 |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 1,100 |  | $ 1,100 |  | $ 2,400
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 51,727 |  | 51,727 |  |
The Fourth Amended 2014 Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 2,086,208 |  | 2,086,208 |  |

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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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