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Note 6 - Earnings (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net loss $ (8,953) $ (15,627) $ (42,190) $ (46,147)
Basic (in shares) 32,774,148 27,839,245 30,392,483 27,639,671
Diluted (in shares) 32,774,148 27,839,245 30,392,483 27,639,671
Basic (in dollars per share) $ (0.27) $ (0.56) $ (1.39) $ (1.67)
Diluted (in dollars per share) $ (0.27) $ (0.56) $ (1.39) $ (1.67)