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Note 12 - Warrants and Derivative Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2019 | Apr. 17, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Nov. 13, 2014
Class of Warrant or Right, Outstanding (in shares) |  |  | 0 |  | 0 |  |  |  |
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants, Net of Tax |  |  |  | $ 1,145 |  | $ 4,092 |  |  |
Hercules Warrants [Member] |  |  |  |  |  |  |  |  |
Gain (Loss) on Decrease Fair Value Upon Exercise of Warrant |  |  |  |  | $ 100 |  |  |  |
November 2014 Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 7.81 |  |  |  |  |  |  |  | $ 7.81
Common Unit, Issued (in shares) |  |  |  |  |  |  |  |  | 909,090
Common Shares Per Unit (in shares) |  |  |  |  |  |  |  |  | 1
Class of Warrant or Right, Number of Warrants to Purchase One Share of Stock (in shares) |  |  |  |  |  |  |  |  | 0.9
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  | 818,181
Class of Warrant or Right, Warrants Exercised (in shares) | 786,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Warrants Expired (in shares) | 32,181 |  |  |  |  |  |  |  |
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants, Net of Tax |  |  |  | $ 1,100 |  | $ 4,100 |  |  |
Hercules Technology Growth Capital [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Exercised (in shares) |  | 22,821 |  |  |  |  |  |  |
Secured Debt [Member] | Hercules Technology Growth Capital [Member] | Hercules Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 7.85 |  |
Derivative, Fair Value, Net, Total |  |  |  |  |  |  |  | $ 400 |

X
- Definition Represents the number of warrants (to purchase one share of stock) included in each unit. + References No definition available. + Details
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X
- Definition The number of warrants or rights exercised during the period. + References No definition available. + Details
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- Definition Represents the gain (loss) in change of fair value of derivative instruments and warrants recorded during the period, net of tax. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Number of common units issued of limited liability company (LLC). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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