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Note 13 - Warrants and Derivative Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 17, 2019 | Dec. 19, 2014 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019 | Nov. 13, 2014
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants |  |  | $ 1,145 | $ 282 | $ 4,092 | $ (182) |  |
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 |  |  |  |  |  |  |  | $ 7.81
Common Unit, Issued |  |  |  |  |  |  |  | 909,090
Common Shares Per Unit |  |  |  |  |  |  |  | 1
Class of Warrant or Right, Number of Warrants to Purchase One Share of Stock |  |  |  |  |  |  |  | 0.9
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  | 818,181
Warrants and Rights Outstanding, Maturity Date |  |  |  |  |  |  |  | Nov. 13, 2019
Hercules Technology Growth Capital [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Exercised | 22,821 |  |  |  |  |  |  |
Secured Debt [Member] | Hercules Technology Growth Capital [Member] | Hercules Warrants [Member] |  |  |  |  |  |  |  |
Purchase Commitment, Issuance of Warrants, Shares of Common Stock |  | 58,823 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 7.85 |  | $ 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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- Definition Represents the number of common shares in each unit. + 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. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: 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=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + 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=118260190&loc=d3e13433-108611 + Details
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- Definition Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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