Note 8 - Earnings Per Share (Details) - Reconciliation of Number of Shares Used in Computation of Basic and Diluted Earnings (Loss) Per Share - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of Number of Shares Used in Computation of Basic and Diluted Earnings (Loss) Per Share [Abstract]
Weighted average number of shares used in computation of basic earnings per share	49,023	45,690	48,388	45,594
Add:
Additional shares from the assumed exercise of employee stock options	2,090	412	1,626	323
Weighted average number of shares used in computation of diluted earnings per share	51,113	46,102	50,011	45,917