Net Income per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
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)	255,500	311,950	257,133	320,697
Less: Shares which could be repurchased under treasury stock method (in shares)	(207,518)	(234,870)	(214,947)	(241,855)
Weighted average number of common shares outstanding - diluted (in shares)	10,770,383	10,799,481	10,764,587	10,801,243
Stock Options [Member]
Antidilutive Securities Excluded from Computation [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	590,550	402,100	615,050	402,100