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Note 5 - Computation of Net Loss Per Common Share (Tables) | 9 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (7,933 | ) |  | $ | (6,845 | ) |  | $ | (15,062 | ) |  | $ | (11,209 | )
Less: decrease in fair value of warrants, net of income tax |  |  | — |  |  |  | (556 | ) |  |  | — |  |  |  | (4,648 | )
Plus: change in fair value due to exercise of warrants |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 83 |
Net loss - diluted |  | $ | (7,933 | ) |  | $ | (7,401 | ) |  | $ | (15,062 | ) |  | $ | (15,774 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares of common stock outstanding |  |  | 26,532 |  |  |  | 22,110 |  |  |  | 24,143 |  |  |  | 21,729 |
Weighted-average shares subject to repurchase |  |  | (1,062 | ) |  |  | (925 | ) |  |  | (1,132 | ) |  |  | (943 | )
Shares used in per-share calculation ― basic |  |  | 25,470 |  |  |  | 21,185 |  |  |  | 23,011 |  |  |  | 20,786 |
Common stock warrants |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 108 |
Shares used in per-share calculation ― diluted |  |  | 25,470 |  |  |  | 21,203 |  |  |  | 23,011 |  |  |  | 20,894 |
Net loss per share ― basic |  | $ | (0.31 | ) |  | $ | (0.32 | ) |  | $ | (0.65 | ) |  | $ | (0.54 | )
Net loss per share ― diluted |  | $ | (0.31 | ) |  | $ | (0.35 | ) |  | $ | (0.65 | ) |  | $ | (0.75 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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