Note 13 - Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Quarterly Financial Information [Table Text Block]

(in thousands except per share data)
	Quarter Ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
Revenues	$	31		$	6		$	287		$	38
Gross profit		31			4			(6	)		(188	)
Operating loss		(2,885	)		(2,986	)		(3,068	)		(4,129	)
Net loss		(4,448	)		(4,584	)		(4,736	)		(5,806	)
Basic and diluted net loss per common share	$	(0.29	)	$	(0.30	)	$	(0.31	)	$	(0.38	)

	Quarter Ended
	March 31, 2011			June 30, 2011			September 30, 2011			December 31, 2011
Revenues	$	457		$	40		$	121		$	401
Gross profit		25			22			(145	)		(324	)
Operating loss		(3,029	)		(2,288	)		(2,704	)		(3,213	)
Net loss		(4,254	)		(3,728	)		(4,105	)		(4,750	)
Basic and diluted net loss per common share	$	(0.31	)	$	(0.27	)	$	(0.29	)	$	(0.33	)