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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 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net (loss) income $ (825) $ 22,558 $ (4,364) $ 17,821
Fair Value Adjustment of Warrants (1,145)   (4,092) 182
Plus: change in fair value due to exercise of warrants 0 0 83 0
Net income (loss) - diluted $ (1,970) $ 22,558 $ (8,373) $ 17,821
Denominator:        
Weighted-average shares of common stock outstanding (in shares) 21,678 21,252 21,538 21,126
Weighted-average shares subject to repurchase (in shares) (1,022) (939) (952) (886)
Shares used in per-share calculation - basic (in shares) 20,656 20,313 20,586 20,240
Common stock awards (in shares) 0 268 0 320
Common stock warrants (in shares) 67 0 150 0
Shares used in per-share calculation - diluted (in shares) 20,723 20,581 20,736 20,560
Net (loss) income per share - basic (in dollars per share) $ (0.04) $ 1.11 $ (0.21) $ 0.88
Net (loss) income per share - diluted (in dollars per share) $ (0.10) $ 1.10 $ (0.40) $ 0.87