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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Changes in Contingent Consideration and Warrant Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Contingent Consideration [Member]      
Balance $ 2,667 $ 3,210 $ 3,649
Additions 0 0 0
Payments or exercises (480) 0 (509)
Adjustment to fair value (158) (543) 70
Balance 2,029 2,667 3,210
Warrant [Member]      
Balance 1,529 1,963 4,404
Additions 0 0 0
Payments or exercises 0 0 0
Adjustment to fair value (818) (434) (2,441)
Balance $ 711 $ 1,529 $ 1,963