Note 9 - Fair Value Measurement - Unrealized Gain or Loss Included in Earnings (Details) - USD ($)	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
The net amount of gains/(losses) for the period included in earnings attributable to the unrealized and realized gains/(losses) from changes in derivative liabilities at the reporting date	$ (1,160,473)	$ 723,532

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

Name:	us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration