Note 15 - Supplemental Cash Flow Information (Details Textual) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	50,224	40,816
Stock Repurchased During Period, Shares	14,571	20,256
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	309,230	360,318