Note 8 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	0	22	0
Price Range Per Share Granted	- - -	74.76 - 74.76	- - -
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	2	0	12
Price Range Per Share Expired	58.50 - 74.64	- - -	49.18 - 58.50
Price Range Per Share Exercised	24.00 - 58.50	24.00 - 58.50	24.00 - 49.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	52	61	54
Price Range Per Share Outstanding	26.52 - 74.64	24.00 - 74.64	24.00 - 58.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	33	31	39
Price Range Per Share Total Exercisable	26.52 - 74.64	24.00 - 58.50	24.00 - 58.50
Common Stock
Common stock issued upon exercise of employee stock options, shares	7	16	9

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