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Note 4 - Fair Value Measurements - Fair Value of Warrant Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair value of warrant liability at December 31, 2021 $ 9,558 $ 0 $ 0
Reclassification of warrant liability to equity (7,502)    
Fair value of warrant liability at March 31, 2022 0   9,558
Fair value of contingent liability at December 31, 2021 561    
Decrease in fair value of contingent liability (219) $ 0  
Fair value of contingent liability at March 31, 2022 342   561
Warrant Liability [Member]      
Decrease in fair value of 2021 Warrants $ (2,056)   (4,614)
Fair value of 2021 Warrants issued     $ 14,172