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Note 13 - Warrants and Derivative Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2019 | Apr. 17, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 26, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Nov. 13, 2014
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | $ 2,740 |  |  | $ 2,740 |  |  |
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 |  |  |  | 556 |  |  | 4,648 |  |
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 |  |  |  | $ 500 |  |  | $ 4,600 |  |
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 |  |  | $ 7.85 |  |  |
Derivative, Fair Value, Net, Total |  |  |  |  |  |  |  | $ 400 |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479 + 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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