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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Numerator:                
Net (loss) income $ (6,845) $ (825) $ (3,539) $ 17,293 $ 22,558 $ (4,737) $ (11,209) $ 35,114
Less: decrease in fair value of warrants, net of income tax (556)     0     (4,648) 0
Plus: change in fair value due to exercise of warrants 0     0     83 0
Net income (loss) - diluted $ (7,401)     $ 17,293     $ (15,774) $ 35,114
Denominator:                
Weighted-average shares of common stock outstanding (in shares) 22,110     21,396     21,729 21,216
Weighted-average shares subject to repurchase (in shares) (925)     (977)     (943) (916)
Shares used in per-share calculation - basic (in shares) 21,185     20,419     20,786 20,300
Common stock awards (in shares) 0     445     0 238
Common stock warrants (in shares) 18     0     108 0
Shares used in per-share calculation - diluted (in shares) 21,203     20,864     20,894 20,538
Net (loss) income per share - basic (in dollars per share) $ (0.32)     $ 0.85     $ (0.54) $ 1.73
Net (loss) income per share - diluted (in dollars per share) $ (0.35)     $ 0.83     $ (0.75) $ 1.71