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Note 17 - Warrant Liabilities - Fair Value of Warrants (Details) | Jun. 30, 2019 yr | Mar. 31, 2019 yr | Dec. 31, 2018 yr | Jun. 30, 2018 yr | Mar. 31, 2018 yr | Jan. 17, 2018 yr
--- | --- | --- | --- | --- | --- | ---
Measurement Input, Share Price [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 1.35 | 1.95 | 1.34 | 2.52 | 1.67 | 3.98
Measurement Input, Share Price [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 1.35 | 1.95 | 1.34 | 2.52 | 1.67 | 3.98
Measurement Input, Expected Term [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 1.1 | 1.3 | 1.55 | 2.1 | 2.3 | 2.5
Measurement Input, Expected Term [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 1.55 | 1.8 | 2.05 | 2.55 | 2.8 | 3
Measurement Input, Risk Free Interest Rate [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 0.0173 | 0.0227 | 0.025 | 0.0253 | 0.0235 | 0.0222
Measurement Input, Risk Free Interest Rate [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 0.0173 | 0.0227 | 0.025 | 0.0256 | 0.025 | 0.0239
Measurement Input, Expected Dividend Rate [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants |  |  |  |  |  |
Measurement Input, Expected Dividend Rate [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants |  |  |  |  |  |
Measurement Input, Price Volatility [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 0.9 | 2.16 | 1.99 | 1.74 | 1.64 | 1.58
Measurement Input, Price Volatility [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 2.02 | 1.87 | 1.76 | 1.59 | 1.52 | 1.47
Measurement Input, Exercise Price [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6
Measurement Input, Exercise Price [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6
Measurement Input, Quoted Price [Member] | Investor Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 0.05 | 1.23 | 0.78 | 1.71 | 1.03 | 2.93
Measurement Input, Quoted Price [Member] | Placement Agent Warrants [Member] |  |  |  |  |  |
Fair value of the warrants | 0.8 | 1.26 | 0.8 | 1.74 | 1.06 | 2.99

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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