Note 8 - Options: Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures	25,000	19,000	21,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period	3,000	400	2,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised	8,000	2,000	4,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	98,000	84,000	67,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	52,000	50,000	40,000
Minimum
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 64.09	$ 77.07	$ 82.6
Expired	49.18	77.05	33.3
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	49.18	49.18	33.3
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price	58.5	49.18	33.3
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price	58.5	49.18	33.3
Maximum
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	64.09	77.07	82.6
Expired	82.6	77.05	77.05
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	58.5	77.05	77.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price	82.6	82.6	77.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 82.6	$ 82.6	$ 77.05

Number of non-option equity instruments exercised by participants.

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
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-Section 50
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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
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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