Note 10 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	22	0	28
Price Range Per Share Granted	74.76 - 74.76	- - -	58.50 - 58.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	0	12	3
Price Range Per Share Expired	- - -	49.18 - 58.50	49.18 - 49.18
Price Range Per Share Exercised	24.00 - 58.50	24.00 - 49.18	24.00 - 49.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	61	54	75
Price Range Per Share Outstanding	24.00 - 74.64	24.00 - 58.50	24.00 - 58.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	31	39	36
Price Range Per Share Total Exercisable	24.00 - 58.50	24.00 - 58.50	24.00 - 50.72
Common Stock
Common stock issued upon exercise of employee stock options, shares	16	9	13

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Number of options outstanding, including both vested and non-vested options.

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