Note 8 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures	21	0	26
Price Range Per Share Granted	82.60 - 82.60	- - -	77.05 - 77.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period	2	3	1
Price Range Per Share Expired	33.30 - 77.05	74.64 - 77.05	58.50 - 77.05
Price Range Per Share Exercised	33.30 - 77.05	26.52 - 77.05	26.52 - 74.64
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	67	52	69
Price Range Per Share Outstanding	33.30 - 77.05	33.30 - 77.05	26.52 - 77.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	40	34	33
Price Range Per Share Total Exercisable	33.30 - 77.05	33.30 - 77.05	26.52 - 74.64
Common Stock
Common stock issued upon exercise of employee stock options, shares	4	14	8

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