Note 9 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		28
Price Range Per Share Granted	- - -	58.50 - 58.50	- - -
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	12	3	7
Price Range Per Share Expired	49.18 - 58.50	49.18 - 49.18	26.58 - 49.18
Price Range Per Share Exercised	24.00 - 49.18	24.00 - 49.18	21.68 - 49.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	54	75	62
Price Range Per Share Outstanding	24.00 - 58.50	24.00 - 58.50	24.00 - 50.72
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	39	36	41
Price Range Per Share Total Exercisable	24.00 - 58.50	24.00 - 50.72	24.00 - 50.72
Common Stock
Common stock issued upon exercise of employee stock options, shares	9	13	22