Note 15 - Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Quarterly Financial Information [Table Text Block]

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
2017
Total revenues	$	11,538,272		$	11,073,502		$	14,404,979		$	24,019,051
Operating loss		(3,183,707	)		(3,709,594	)		(6,342,528	)		(2,657,037	)
Net loss		(3,093,143	)		(3,487,971	)		(6,235,543	)		(2,599,892	)
Net loss per share:(1)
Basic	$	(0.10	)	$	(0.09	)	$	(0.16	)	$	(0.07	)
Diluted	$	(0.10	)	$	(0.09	)	$	(0.16	)	$	(0.07	)
2016
Total revenues	$	-		$	-		$	1,465,121		$	3,750,538
Operating loss		(3,833,323	)		(603,330	)		(1,483,406	)		(1,609,725	)
Net loss		(3,834,565	)		(612,799	)		(1,532,698	)		(1,535,087	)
Net loss per share:(2)
Basic		—			—			—			—
Diluted		—			—			—			—