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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	48,881	45,606	48,063	45,545
Add:
Additional shares from the assumed exercise of employee stock options	1,719	357	1,381	282
Weighted average number of shares used in computation of diluted earnings per share	50,600	45,963	49,444	45,827