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Note 4 - Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net loss $ (2,485) $ (5,398) $ (9,881) $ (8,710) $ (7,883) $ (18,590)
Weighted-average shares of common stock outstanding (in shares) 30,283   28,775   29,996 28,648
Weighted-average shares subject to repurchase (in shares) (1,455)   (908)   (1,451) (934)
Shares used in per-share calculation ? basic (in shares) 28,828   27,867   28,545 27,714
Shares used in per-share calculation ? diluted (in shares) 28,828   27,867   28,545 27,714
Net loss per share ? basic (in dollars per share) $ (0.09)   $ (0.35)   $ (0.28) $ (0.67)
Net loss per share ? diluted (in dollars per share) $ (0.09)   $ (0.35)   $ (0.28) $ (0.67)