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Note 8 - Fair Value of Financial Instruments (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents, Fair Value Disclosure $ 100 $ 100
Fair Value, Inputs, Level 2 [Member]    
Cash and Cash Equivalents, Fair Value Disclosure $ 35,100 $ 0