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Note 17 - Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Jan. 17, 2018
Proceeds allocated to warrant liabilities | $ 135 | $ 1,327 | $ 135 | $ 1,327 | $ 956 | $ 606 | $ 801 | $ 2,275
Change in fair value of warrants | (821) | 526 | (471) | (948) |  |  |  |
Investor Warrants [Member] |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 32 | 1,103 | 32 | 1,103 | 793 | 503 | 664 | 1,890
Change in fair value of warrants | (761) | 439 | (471) | (787) |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | 103 | 224 | 103 | 224 | $ 163 | $ 103 | $ 137 | $ 385
Change in fair value of warrants | $ (60) | $ 87 |  | $ (161) |  |  |  |

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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