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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, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Net loss $ (4,324) $ (4,434) $ (5,403) $ (7,933) $ (3,712) $ (3,417) $ (14,161) $ (15,062)
Weighted-average shares of common stock outstanding (in shares) 28,418     26,532     28,234 24,143
Weighted-average shares subject to repurchase (in shares) (1,066)     (1,062)     (1,089) (1,132)
Shares used in per-share calculation - basic (in shares) 27,352     25,470     27,145 23,011
Shares used in per-share calculation - diluted (in shares) 27,352     25,470     27,145 23,011
Net loss per share - basic (in dollars per share) $ (0.16)     $ (0.31)     $ (0.52) $ (0.65)
Net loss per share - diluted (in dollars per share) $ (0.16)     $ (0.31)     $ (0.52) $ (0.65)