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Note 8 - Fair Value Measurements (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 24, 2020 | Mar. 23, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 10, 2021 | Mar. 24, 2021 | Mar. 23, 2021
Fair Value Adjustment of Warrants |  |  | $ (573) | $ (259) |  |  |
Additional Paid-in Capital [Member] | Reclassification of Warrant Liability to Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Current Period Reclassification Adjustment |  | $ 1,300 |  |  |  |  |
Additional Paid-in Capital [Member] | Reclassification of Debt Issuance Costs to Additional Paid In Capital [Member] |  |  |  |  |  |  |
Current Period Reclassification Adjustment | $ 1,900 | $ 1,300 |  |  |  |  |
2017 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 362,500 |  |  |  |  | 362,500 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.01 | $ 6.75 |  |  | $ 0.01 | $ 0.01 | $ 6.75

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