Note 6 - Restructuring Charge (Details) - Timing of Repayments Under Restructuring Plan (USD $)	3 Months Ended		6 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Jun. 30, 2013 Severance & Fringe Benefits [Member]	Mar. 31, 2013 Severance & Fringe Benefits [Member]	Dec. 31, 2012 Severance & Fringe Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge		$ 253,000	$ (67,000)			$ 253,000
Cash payments during quarter				(23,000)	(72,000)	(91,000)
Remaining liability as of June 30, 2013				0
Reduction of restructuring charge during quarter ended March 31, 2013	$ (67,000)				$ (67,000)