Note 8 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	0	26	0
Price Range Per Share Granted	- - -	77.05 - 77.05	- - -
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	3	1	2
Price Range Per Share Expired	74.64 - 77.05	58.50 - 77.05	58.50 - 74.64
Price Range Per Share Exercised	26.52 - 77.05	26.52 - 74.64	24.00 - 58.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	52	69	52
Price Range Per Share Outstanding	33.30 - 77.05	26.52 - 77.05	26.52 - 74.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	34	33	33
Price Range Per Share Total Exercisable	33.30 - 77.05	26.52 - 74.64	26.52 - 74.64
Common Stock
Common stock issued upon exercise of employee stock options, shares	14	8	7

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