Note 10 - Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	First			Second			Third			Fourth
2014 Quarters
Revenues	$	3,458		$	1,466		$	3,238		$	5,446
Net Loss		(10,137	)		(14,649	)		(8,731	)		(11,672	)
Basic and diluted net loss per share		(0.17	)		(0.23	)		(0.12	)		(0.16	)

2013 Quarters
Revenues	$	3,554		$	821		$	2,389		$	10,567
Net Loss		(4,506	)		(12,172	)		(8,001	)		(5,429	)
Basic and diluted net loss per share		(0.09	)		(0.23	)		(0.14	)		(0.09	)