Note 8 - Common Stock (Details) - Combined Stock Option Activity (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Combined Stock Option Activity [Abstract]
Number of Options	2,187	2,053	1,332	1,470
Weighted Average Option Price	$ 4.11	$ 4.06	$ 4.21	$ 5.00
Aggregate Intrinsic Value	$ 1,455	$ 448	$ 1,724	$ 0
Exercisable at December 31, 2013	601
Exercisable at December 31, 2013	$ 4.76
Exercisable at December 31, 2013	$ 649
Number of Options Granted	592	1,095	370
Weighted Average Option Price, Granted	$ 4.33	$ 3.94	$ 2.98
Number of Options Exercised	(15)	(176)	(107)
Weighted Average Option Price, Exercised	$ 1.71	$ 4.71	$ 4.92
Number of Options Canceled	(443)	(198)	(401)
Weighted Average Option Price, Canceled	$ 4.69	$ 3.79	$ 5.77