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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 6 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net loss $ (4,434) $ (5,403) $ (3,712) $ (3,417) $ (9,837) $ (7,129)
Weighted-average shares of common stock outstanding (in shares) 28,360   23,057   28,141 22,943
Weighted-average shares subject to repurchase (in shares) (1,108)   (1,197)   (1,101) (1,168)
Shares used in per-share calculation - basic (in shares) 27,252   21,860   27,040 21,775
Shares used in per-share calculation - diluted (in shares) 27,252   21,860   27,040 21,775
Net loss per share - basic (in dollars per share) $ (0.16)   $ (0.17)   $ (0.36) $ (0.33)
Net loss per share - diluted (in dollars per share) $ (0.16)   $ (0.17)   $ (0.36) $ (0.33)