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Note 2 - Summary of Significant Accounting Policies - Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Net loss $ (22,678) $ (17,096) $ (22,678) $ (17,096)
Less: decrease in fair value of warrants, net of income tax $ 4,648 (4,648)
Plus: change in fair value due to exercise of warrants     83
Net loss - diluted     $ (22,678) $ (21,662)
Weighted-average shares of common stock outstanding (in shares)     24,991 21,937
Weighted-average shares subject to repurchase (in shares)     (1,112) (953)
Shares used in per-share calculation - basic (in shares) 23,879 20,985 23,879 20,985
Common stock warrants (in shares)     84
Shares used in per-share calculation - diluted (in shares) 23,879 21,069 23,879 21,069
Net loss per share - basic (in dollars per share) $ (0.95) $ (0.81) $ (0.95) $ (0.81)
Net loss per share - diluted (in dollars per share) $ (0.95) $ (1.03) $ (0.95) $ (1.03)