Note 14 - Warrants (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Warrant Activity [Table Text Block]

Warrants	Number of Warrants Issued			Weighted Average Exercise Price
Warrants outstanding at December 31, 2016		20,831,883		$	1.88
Warrants issued during the three months ended March 31, 2017 (see Note 11)		19,089,402			0.20
Warrants exercised during the three months ended March 31, 2017 (see Note 11)		(4,858,966	)		0.03
Warrants outstanding at March 31, 2017		35,062,319		$	1.22
Aggregate intrinsic value of outstanding warrants at March 31, 2017	$	964,827
Weighted average remaining contractual terms at March 31, 2017 (in years)		4.16