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Note 3 - Shareholders' Equity (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2020	Dec. 31, 2004
Stock Repurchased and Retired During Period, Shares	221,413	270,000
Payments for Repurchase of Common Stock	$ 1,178,000	$ 1,417,000
Share Repurchase Program, Remaining Authorized, Amount	$ 1,564,000
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	9,870
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 74,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 4 months 13 days
The2004 Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant				5,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross			5,009,750
Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance	1,800,000
Incentive Plan 2020 [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	9,870	10,715
Share-Based Payment Arrangement, Expense	$ 121,000	$ 94,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 574,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 6 months

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Topic 718
-SubTopic 10
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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The cash outflow to reacquire common stock during the period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Number of shares that have been repurchased and retired during the period.

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