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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 9 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Net loss $ (1,649) $ (2,485) $ (5,398) $ (9,581) $ (9,881) $ (8,710) $ (9,532) $ (28,171)
Weighted-average shares of common stock outstanding (in shares) 30,547     29,354     30,180 28,884
Weighted-average shares subject to repurchase (in shares) (1,455)     (1,400)     (1,452) (1,090)
Shares used in per-share calculation ? basic (in shares) 29,092     27,954     28,728 27,794
Shares used in per-share calculation ? diluted (in shares) 29,092     27,954     28,728 27,794
Net loss per share ? basic (in dollars per share) $ (0.06)     $ (0.34)     $ (0.33) $ (1.01)
Net loss per share ? diluted (in dollars per share) $ (0.06)     $ (0.34)     $ (0.33) $ (1.01)