Note 8 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - shares	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures	19,000	21,000	0
Price Range Per Share Granted	77.07 - 77.07	82.60 - 82.60	- - -
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period	400	2,000	3,000
Price Range Per Share Expired	77.05 - 77.05	33.30 - 77.05	74.64 - 77.05
Price Range Per Share Exercised	49.18 - 77.05	33.30 - 77.05	26.52 - 77.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	84,000	67,000	52,000
Price Range Per Share Outstanding	49.18 - 82.60	33.30 - 77.05	33.30 - 77.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	50,000	40,000	34,000
Price Range Per Share Total Exercisable	49.18 - 82.60	33.30 - 77.05	33.30 - 77.05
Common Stock
Common stock issued upon exercise of employee stock options, shares	2,000	4,000	14,000

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Represents the description of Price Range Per Share Granted, during the indicated time period.

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Represents the description of Price Range Per Share Outstanding, during the indicated time period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Net number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
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-Section 50
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-Publisher FASB
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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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Number of share options (or share units) exercised during the current period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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