Note 12 - Quarterly Financial Information (Unaudited, in Thousands, Except Share and Per Share Data) (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Schedule of Quarterly Financial Information [Table Text Block]

	Three Months Ended
	March 31, 2015			June 30, 2015			September 30, 2015			December 31, 2015
Revenue	$	-		$	-		$	-		$	-
Operating expenses		4,620			4,981			5,082			6,187
Net loss attributable to common stockholders		(4,580	)		(5,072	)		(5,383	)		(6,342	)
Net loss per share attributable to common stockholders:
Basic and Diluted	$	(0.28	)	$	(0.31	)	$	(0.33	)	$	(0.38	)
Weighted-average common shares outstanding used in net loss per share attributable to common stockholders:
Basic and Diluted		16,448,688			16,449,937			16,466,945			16,490,430
	Three Months Ended
	March 31, 2014			June 30, 2014			September 30, 2014			December 31, 2014
Revenue	$	-		$	-		$	2,948		$	-
Operating expenses		1,933			2,508			2,814			3,273
Net (loss) income		(2,831	)		(2,563	)		(5,181	)		7,233
Net (loss) income attributable to common stockholders - basic		(4,343	)		(4,460	)		(7,458	)		5,938
Net (loss) income attributable to common stockholders - diluted		(4,343	)		(4,460	)		(7,458	)		5,938
Net (loss) income per share attributable to common stockholders:
Basic	$	(18.09	)	$	(18.55	)	$	(31.00	)	$	0.52
Diluted	$	(18.09	)	$	(18.55	)	$	(31.00	)	$	0.48
Weighted-average common shares outstanding used in net (loss) income per share attributable to common stockholders:
Basic		240,138			240,374			240,610			11,444,807	(a)
Diluted		240,138			240,374			240,610			12,295,431	(a)