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Note 16 - Stockholders' Equity (Tables) | 12 Months Ended
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Mar. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Fiscal years ended March 31, |
|  | 2022 |  |  | 2021 |
Stock options |  | $ | 3 |  |  | $ | 19 |
Restricted stock and stock awards |  |  | 4,615 |  |  |  | 3,428 |
Employee stock purchase plan |  |  | 43 |  |  |  | 38 |
Total stock-based compensation expense |  | $ | 4,661 |  |  | $ | 3,485 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Fiscal years ended March 31, |
|  | 2022 |  |  | 2021 |
Cost of revenues |  | $ | 209 |  |  | $ | 40 |
Research and development |  |  | 820 |  |  |  | 642 |
Selling, general and administrative |  |  | 3,632 |  |  |  | 2,803 |
Total |  | $ | 4,661 |  |  | $ | 3,485 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Options / Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (thousands) |
Outstanding at March 31, 2021 |  |  | 127,165 |  |  | $ | 44.37 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled/forfeited |  |  | (28,880 | ) |  |  | 99.33 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2022 |  |  | 98,285 |  |  | $ | 28.23 |  |  |  | 1.5 |  |  | $ | 8 |
Exercisable at March 31, 2022 |  |  | 98,285 |  |  | $ | 28.23 |  |  |  | 1.5 |  |  | $ | 8 |
Fully vested and expected to vest at March 31, 2022 |  |  | 98,285 |  |  | $ | 28.23 |  |  |  | 1.5 |  |  | $ | 8 |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Intrinsic Aggregate Value (thousands) |
Outstanding at March 31, 2021 |  |  | 1,047,914 |  |  | $ | 7.17 |  |  |  |  |
Granted |  |  | 569,348 |  |  |  | 14.47 |  |  |  |  |
Vested |  |  | (498,396 | ) |  |  | 10.25 |  |  |  |  |
Forfeited |  |  | (7,200 | ) |  |  | 11.50 |  |  |  |  |
Outstanding at March 31, 2022 |  |  | 1,111,666 |  |  | $ | 9.65 |  |  | $ | 8,460 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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