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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2022
Notes Tables |
Property Plant and Equipment Useful Life [Table Text Block] |
Asset Classification |  | Estimated Useful Life in Years |
Machinery and equipment |  | 3-10 |
Furniture and fixtures |  | 3-5 |
Leasehold improvements |  | Shorter of the estimated useful life or the remaining lease term |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Fiscal year ended March 31, |
|  | 2022 |  |  | 2021 |
Numerator: |  |  |  |  |  |  |  |
Net loss |  | $ | (19,193 | ) |  | $ | (22,678 | )
Denominator: |  |  |  |  |  |  |  |
Weighted-average shares of common stock outstanding |  |  | 28,293 |  |  |  | 24,991 |
Weighted-average shares subject to repurchase |  |  | (1,090 | ) |  |  | (1,112 | )
Shares used in per-share calculation ― basic |  |  | 27,203 |  |  |  | 23,879 |
Shares used in per-share calculation ― diluted |  |  | 27,203 |  |  |  | 23,879 |
Net loss per share ― basic |  | $ | (0.71 | ) |  | $ | (0.95 | )
Net loss per share ― diluted |  | $ | (0.71 | ) |  | $ | (0.95 | )

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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