Note 3 - Net Income (Loss) per Share (Details) - Computation of Net Income (Loss) Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic net income (loss) per share:
Net income (loss) (in Dollars)	$ 1,291	$ (5,949)	$ 4,266	$ (8,696)
Weighted average class A and B common shares outstanding	41,863	41,678	41,644	41,697
Basic net income (loss) per share (in Dollars per share)	$ 0.03	$ (0.14)	$ 0.10	$ (0.21)
Diluted net income (loss) per share:
Weighted average class A and B common shares outstanding for diluted net income per share	42,787	41,678	42,662	41,697
Diluted net income (loss) per share (in Dollars per share)	$ 0.03	$ (0.14)	$ 0.10	$ (0.21)
Common Stock [Member]
Diluted net income (loss) per share:
Weighted average class A and B common shares outstanding for diluted net income per share	41,863	41,678	41,644	41,697
Treasury Stock [Member]
Diluted net income (loss) per share:
Assumed exercise of stock options under the treasury stock method	924		1,018