Note 3 - Earnings Per Share - Shares Used in Calculation of Earnings Per Share (Details) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Weighted-average common shares outstanding (in shares)	9,960,503	9,946,454	9,959,316	9,944,025
Average treasury stock shares (in shares)	(1,879,310)	(1,879,310)	(1,879,310)	(1,864,851)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	8,081,193	8,067,144	8,080,006	8,079,174
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share (in shares)	32,379	5,355	27,060	5,355
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	8,113,572	8,072,499	8,107,066	8,084,529

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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