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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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Amount of cost to be recognized for option under share-based payment arrangement.

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The cash outflow to reacquire common stock during the period.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Note 6 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended		3 Months Ended
	Feb. 28, 2023	Jan. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Nov. 30, 2022
Share-Based Payment Arrangement, Expense			$ 15,000	$ 75,000
Stock Repurchase Program, Authorized Amount					$ 5,000,000.0
Stock Repurchased During Period, Shares (in shares)			303,638
Payments for Repurchase of Common Stock			$ 366,000	(0)
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)			10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount			$ 91,300
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			3 months
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 17,100
Performance Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 3 months 18 days
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 10,600
Share-Based Payment Arrangement, Expense				$ 12,000
Performance Stock Units [Member] \| Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease), Total (in shares)		(50,000)
Share-Based Payment Arrangement, Expense			3,300
Performance Stock Units [Member] \| Chief Financial Officer [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease), Total (in shares)		(33,333)
Share-Based Payment Arrangement, Reversal of Expense	$ 18,000