Net Income per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income per Share [Abstract]
Weighted average number of common shares outstanding - basic (in shares)	10,722,401	10,722,401	10,722,401	10,722,401
Potential shares exercisable under stock option plans (in shares)	237,000	278,100	237,692	278,100
Less: Shares which could be repurchased under treasury stock method (in shares)	(201,052)	(243,774)	(199,696)	(228,054)
Weighted average number of common shares outstanding - diluted (in shares)	10,758,349	10,756,727	10,760,397	10,772,447
Stock Options [Member]
Antidilutive Securities Excluded from Computation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	393,200	290,650	393,200	290,650