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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 7 Months Ended 9 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Oct. 26, 2019
Dec. 31, 2020
Dec. 31, 2019
Net loss $ (7,933) $ (3,712) $ (3,417) $ (6,845) $ (825) $ (3,539) $ (11,209) $ (15,062) $ (11,209)
Less: decrease in fair value of warrants, net of income tax     (556)     $ 4,648 (4,648)
Plus: change in fair value due to exercise of warrants           83
Net loss - diluted $ (7,933)     $ (7,401)       $ (15,062) $ (15,774)
Weighted-average shares of common stock outstanding (in shares) 26,532     22,110       24,143 21,729
Weighted-average shares subject to repurchase (in shares) (1,062)     (925)       (1,132) (943)
Shares used in per-share calculation - basic (in shares) 25,470     21,185       23,011 20,786
Common stock warrants (in shares)     18       108
Shares used in per-share calculation - diluted (in shares) 25,470     21,203       23,011 20,894
Net loss per share - basic (in dollars per share) $ (0.31)     $ (0.32)       $ (0.65) $ (0.54)
Net loss per share - diluted (in dollars per share) $ (0.31)     $ (0.35)       $ (0.65) $ (0.75)