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Note 5 - 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 9 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Net loss $ (9,581) $ (9,881) $ (8,710) $ (4,324) $ (4,434) $ (5,403) $ (28,171) $ (14,161)
Weighted-average shares of common stock outstanding (in shares) 29,354     28,418     28,884 28,234
Weighted-average shares subject to repurchase (in shares) (1,400)     (1,066)     (1,090) (1,089)
Shares used in per-share calculation ? basic (in shares) 27,954     27,352     27,794 27,145
Shares used in per-share calculation ? diluted (in shares) 27,954     27,352     27,794 27,145
Net loss per share ? basic (in dollars per share) $ (0.34)     $ (0.16)     $ (1.01) $ (0.52)
Net loss per share ? diluted (in dollars per share) $ (0.34)     $ (0.16)     $ (1.01) $ (0.52)