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Note 3 - Stock-based Compensation (Details Textual) - USD ($) shares in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares) | 0 | 0 | 0 | 0 |  |  |  |
Share-based Payment Arrangement, Expense | $ 292,000 | $ (75,000) | $ 389,000 | $ (188,000) |  |  |  |
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent | 887,000 | $ 289,000 | 887,000 | $ 289,000 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 657,000 |  | $ 657,000 |  |  |  |  |
Restricted Stock [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  | $ 25,000 | $ 188,000 | $ 317,000 | $ 127,000

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