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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
Jun. 30, 2020
Jun. 30, 2019
Net loss $ (3,417) $ (3,539)
Weighted-average shares of common stock outstanding (in shares) 22,827 21,499
Weighted-average shares subject to repurchase (in shares) (1,138) (985)
Shares used in per-share calculation - basic (in shares) 21,689 20,514
Shares used in per-share calculation - diluted (in shares) 21,689 20,514
Net loss per share ? basic (in dollars per share) $ (0.16) $ (0.17)
Net loss per share ? diluted (in dollars per share) $ (0.16) $ (0.17)