Note 1 - Share-based Compensation Amounts Recognized in Financial Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Non-cash share-based compensation expense	$ 1,383	$ 742	$ 955
Amount of related income tax benefit	(505)	(269)	(377)
Total impact to net income	$ 878	$ 473	$ 578