Note 14 - Earnings Per Share - Dilutive Effect of Stock Options and Awards (Details) - shares shares in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[1]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic (in shares)	18,988	18,965	19,008	18,994		19,102	19,316	19,475	19,450	18,989	19,335	19,608
Effect of potential exercise of stock options, RSUs, and performance shares (in shares)										427	328	389
Diluted weighted-average shares outstanding (in shares)	19,512	19,329	19,293	19,273		19,373	19,556	19,706	19,838	19,416	19,663	19,997

[1] Includes adjustments for the adoption ASU 2016-09 in the second quarter of 2016.