Note 10 - Fair Value Measurements - Reconciliation of Contingent Consideration Liability (Details) - Contingent Consideration [Member]	6 Months Ended
Jun. 30, 2017 USD ($)
Issued in connection with the Series A convertible preferred stock	$ 35,225,846
Change in fair value	(10,468,176)
Balance	$ 24,757,670

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration