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

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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 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options outstanding, including both vested and non-vested options.

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Number of shares issued under share-based payment arrangement.

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Note 8 - Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2017
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross				94,000	94,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				458,700	452,700	387,500
Service-based Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross				94,000	73,000
Market Condition Options [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				5,000
Market Condition Options [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				5,000
Market Condition Options [Member] \| Share-Based Payment Arrangement, Tranche Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				5,000
Market Condition Options [Member] \| Share-Based Payment Arrangement, Tranche Four [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				3,000
Market Condition Options [Member] \| Share-Based Payment Arrangement, Tranche Five [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				3,000
Market Condition Options [Member] \| Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross					21,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense				$ 256	$ 237
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount				$ 873
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				3 years 11 months 15 days
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense				$ 167	$ 97
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount				$ 206
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 1 month 9 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 9.11	$ 12
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number				27,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms				9 years 1 month 13 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period				10,500	0
Stock Incentive Plan 2017 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized							350,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized	100,000	175,000	50,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period				116,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross					115,000
Stock Incentive Plan 2017 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period				22,500	21,000