Note 7 - Shareholders' Equity (Details) - Stock option activity (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended			6 Months Ended
	Jan. 31, 2011	Mar. 31, 2008	Dec. 31, 2005	Jun. 30, 2013
Stock option activity [Abstract]
Shares under option at January 1, 2013				2,211,488
Shares under option at January 1, 2013 (in Dollars per share)				$ 7.47
Options granted	50,000	50,000	48,000	153,000
Options granted (in Dollars per share)				$ 3.49
Options exercised				(3,000)
Options exercised (in Dollars per share)				$ 3.91
Options forfeited				(29,882)
Options forfeited (in Dollars per share)				$ 4.26
Options expired				(162,068)
Options expired (in Dollars per share)				$ 10.87
Shares under option at June 30, 2013				2,169,538
Shares under option at June 30, 2013 (in Dollars per share)				$ 6.98
Shares under option at June 30, 2013				4 years 211 days
Shares under option at June 30, 2013 (in Dollars)				$ 74
Vested and expected to vest as of June 30, 2013				1,958,735
Vested and expected to vest as of June 30, 2013 (in Dollars per share)				$ 7.22
Vested and expected to vest as of June 30, 2013				4 years 193 days
Vested and expected to vest as of June 30, 2013 (in Dollars)				56
Options exercisable at June 30, 2013				960,662
Options exercisable at June 30, 2013 (in Dollars per share)				$ 6.72
Options exercisable at June 30, 2013				3 years 215 days
Options exercisable at June 30, 2013 (in Dollars)				$ 0