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Note 9 - Intangible Assets, Net (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Amortization of Intangible Assets $ 0.2 $ 0.2 $ 0.3 $ 0.3
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)     6 years