Note 15 - Basic and Diluted Loss Per Share - Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ (1,957)	$ (3,003)	$ 4,813
Weighted average number of shares of common stock outstanding during the year used to compute basic net earnings (loss) per share (in thousands) (in shares)	22,512	22,229	21,800
Incremental shares attributable to exercise of outstanding options, SARs and RSUs (assuming proceeds would be used to purchase treasury stock) (in thousands) (in shares)			1,087
Weighted average number of shares of common stock used to compute diluted net earnings (loss) per share (in thousands) (in shares)	22,512	22,229	22,887
Basic net earnings (loss) per share (in dollars per share)	$ (0.09)	$ (0.14)	$ 0.22
Diluted net earnings (loss) per share (in dollars per share)	$ (0.09)	$ (0.14)	$ 0.21