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Note 4 - Computation of Net Loss per Common Share (Tables) | 9 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | $ | (6,845 | ) |  | $ | 17,293 |  |  | $ | (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 |  |  | 22,110 |  |  |  | 21,396 |  |  |  | 21,729 |  |  |  | 21,216 |
Weighted-average shares subject to repurchase |  |  | (925 | ) |  |  | (977 | ) |  |  | (943 | ) |  |  | (916 | )
Shares used in per-share calculation ― basic |  |  | 21,185 |  |  |  | 20,419 |  |  |  | 20,786 |  |  |  | 20,300 |
Common stock awards |  |  | 0 |  |  |  | 445 |  |  |  | 0 |  |  |  | 238 |
Common stock warrants |  |  | 18 |  |  |  | 0 |  |  |  | 108 |  |  |  | 0 |
Shares used in per-share calculation ― diluted |  |  | 21,203 |  |  |  | 20,864 |  |  |  | 20,894 |  |  |  | 20,538 |
Net (loss) income per share ― basic |  | $ | (0.32 | ) |  | $ | 0.85 |  |  | $ | (0.54 | ) |  | $ | 1.73 |
Net (loss) income per share ― diluted |  | $ | (0.35 | ) |  | $ | 0.83 |  |  | $ | (0.75 | ) |  | $ | 1.71 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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