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Note 13 - Warrants and Derivative Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 17, 2019 | Dec. 19, 2014 | Nov. 13, 2014 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants |  |  |  | $ 2,946 | $ (464) |
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 |  |  |
Investment Warrants Expiration 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 |  |
Derivative, Fair Value, Net, Total |  |  |  |  |  | $ 400

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- Definition Expiration date of warrants held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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