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Note 2 - Fair Value Measurement - Fair Value of Warrant Liabilities Using Level 3 Inputs (Details) - Warrant Liabilities [Member] - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Beginning balance as of December 31, 2021 and 2020 $ 0 $ 2,780
Exercised warrants 0 (2,901)
Change in fair value recognized in net (loss) income 0 121
Ending balance $ 0 $ 0