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Note 3 - Stock-based Compensation (Details Textual) - USD ($) shares in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance |  | 0 | 0 | 0 | 0 |  |  |
Share-based Payment Arrangement, Expense |  | $ 180,000 | $ 90,000 | $ 270,000 | $ 226,000 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  | 416,000 | $ 351,000 |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  | $ 354,000 |  | $ 354,000 |  |  |  |
Restricted Stock [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 63,000 |  |  |  |  | $ 21,000 | $ 131,000 | $ 139,000

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