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Note 13 - Warrants and Derivative Liabilities - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details) $ in Millions | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) yr | Dec. 31, 2018 USD ($) yr | Sep. 30, 2018 USD ($) yr | Jun. 30, 2018 USD ($) yr | Mar. 31, 2018 USD ($) yr
--- | --- | --- | --- | --- | --- | ---
Fair value | $ 1.7 | $ 4.6 | $ 3.6 | $ 1.3 | $ 1.6 | $ 1.1
Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.0211 | 0.0243 | 0.0261 | 0.0262 | 0.024 | 0.022
Measurement Input, Expected Dividend Rate [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  |
Measurement Input, Price Volatility [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.6058 | 0.7561 | 0.7029 | 0.6366 | 0.674 | 0.6586
Measurement Input, Expected Term [Member] |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.37 | 0.62 | 0.87 | 1.12 | 1.37 | 1.62

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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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- 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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