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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

X

- 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

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X

- 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

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