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Note 8 - Fair Value of Financial Instruments (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Stockholders' Equity Attributable to Parent, Ending Balance $ 135,156 $ 138,136 $ 139,701   $ 27,168
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Stockholders' Equity Attributable to Parent, Ending Balance       $ 13,003