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Note 4 - Computation of Net Loss Per Common Share (Tables) | 6 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (3,712 | ) |  | $ | (825 | ) |  | $ | (7,129 | ) |  | $ | (4,364 | )
Less: decrease in fair value of warrants, net of income tax |  |  | — |  |  |  | (1,145 | ) |  |  | — |  |  |  | (4,092 | )
Plus: change in fair value due to exercise of warrants |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 83 |
Net income (loss) - diluted |  | $ | (3,712 | ) |  | $ | (1,970 | ) |  | $ | (7,129 | ) |  | $ | (8,373 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares of common stock outstanding |  |  | 23,057 |  |  |  | 21,678 |  |  |  | 22,943 |  |  |  | 21,538 |
Weighted-average shares subject to repurchase |  |  | (1,197 | ) |  |  | (1,022 | ) |  |  | (1,168 | ) |  |  | (952 | )
Shares used in per-share calculation ― basic |  |  | 21,860 |  |  |  | 20,656 |  |  |  | 21,775 |  |  |  | 20,586 |
Common stock warrants |  |  | — |  |  |  | 67 |  |  |  | — |  |  |  | 150 |
Shares used in per-share calculation ― diluted |  |  | 21,860 |  |  |  | 20,723 |  |  |  | 21,775 |  |  |  | 20,736 |
Net loss per share ― basic |  | $ | (0.17 | ) |  | $ | (0.04 | ) |  | $ | (0.33 | ) |  | $ | (0.21 | )
Net loss per share ― diluted |  | $ | (0.17 | ) |  | $ | (0.10 | ) |  | $ | (0.33 | ) |  | $ | (0.40 | )

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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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