Note 6 - Net Income Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,214	$ 2,149	$ 4,276	$ 8,116
Basic weighted average common shares outstanding (in shares)	31,276	31,522	31,222	31,429
Dilutive effect of equity incentive plans (in shares)	747	878	650	916
Diluted weighted average common shares outstanding (in shares)	32,023	32,400	31,872	32,345
Basic (in dollars per share)	$ 0.07	$ 0.07	$ 0.14	$ 0.26
Earnings Per Share, Diluted	$ 0.07	$ 0.07	$ 0.13	$ 0.25