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Note 2 - Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net loss $ (35,041) $ (19,193)
Weighted-average shares of common stock outstanding (in shares) 29,038 28,293
Weighted-average shares subject to repurchase (in shares) (1,190) (1,090)
Shares used in per-share calculation - basic (in shares) 27,848 27,203
Shares used in per-share calculation - diluted (in shares) 27,848 27,203
Net loss per share - basic (in dollars per share) $ (1.26) $ (0.71)
Net loss per share - diluted (in dollars per share) $ (1.26) $ (0.71)