Note 3 - Earnings Per Share - Shares Used in Calculation of Earnings Per Share (Details) - shares	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Weighted-average common shares outstanding (in shares)	9,963,968	9,950,342	9,960,883	9,946,146
Average treasury stock shares (in shares)	(1,879,310)	(1,879,310)	(1,879,310)	(1,869,706)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	8,084,658	8,071,032	8,081,573	8,076,440
Additional common stock equivalents (restricted stock) used to calculate diluted earnings per share (in shares)	62,837	15,840	48,640	15,840
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	8,147,495	8,086,872	8,130,213	8,092,280

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.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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