Net Income per Share (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Income per Share [Abstract]
Weighted average number of common shares outstanding - basic (in shares)	10,722,401	10,722,401
Potential shares exercisable under stock option plans (in shares)	258,000	306,650
Less: Shares which could be repurchased under treasury stock method (in shares)	(213,492)	(231,950)
Weighted average number of common shares outstanding - diluted (in shares)	10,766,909	10,797,101
Stock Options [Member]
Antidilutive Securities Excluded from Computation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	529,900	379,900