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Note 3 - Stock-based Compensation (Tables) | 9 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Cost of revenues |  | $ | 21 |  |  | $ | 42 |  |  | $ | 45 |  |  | $ | 132 |
Research and development |  |  | 117 |  |  |  | 168 |  |  |  | 219 |  |  |  | 289 |
Selling, general and administrative |  |  | 452 |  |  |  | 582 |  |  |  | 971 |  |  |  | 1,981 |
Total |  | $ | 590 |  |  | $ | 792 |  |  | $ | 1,236 |  |  | $ | 2,402 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Expected volatility |  |  | N/A |  |  |  | N/A |  |  |  | 66.5 | % |  |  | N/A |
Risk-free interest rate |  |  | N/A |  |  |  | N/A |  |  |  | 1.8 | % |  |  | N/A |
Expected life (years) |  |  | N/A |  |  |  | N/A |  |  |  | 5.91 |  |  |  | N/A |
Dividend yield |  | N/A |  |  |  | N/A |  |  | None |  |  |  | N/A |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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