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Note 16 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Expense (Benefit), Total | $ (599,000) | $ (4,988,000) | $ (4,937,000) | $ (17,540,000)
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 5.00% |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount |  |  | $ 510,000 |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  |  | $ 397,000 |
Effective Income Tax Rate Reconciliation, Before Discrete Items, Percent |  |  | 5.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |
Deferred Tax Assets, Valuation Allowance | $ 20,500,000 |  | $ 20,500,000 |

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