CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Employees	Directors	Total Share holders’ Equity	Total Share holders’ Equity Employees	Total Share holders’ Equity Directors	Common Stock	Common Stock Employees	Common Stock Directors	Capital in Excess of Par Value	Capital in Excess of Par Value Employees	Capital in Excess of Par Value Directors	Retained Earnings	Accumulated Other Comp- rehensive Income (loss), net	Non- Controlling Interest
Beginning balance (shares) at Dec. 31, 2022							18,919,372
Beginning balance at Dec. 31, 2022	$ 444,211			$ 407,145			$ 1,892			$ 64,212			$ 342,317	$ (1,276)	$ 37,066
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)							35,470
Exercise of stock options	803			803			$ 4			799
Stock option grant compensation	49			49						49
Restricted stock compensation	773			773						773
Shares granted to Employees and Directors (shares)								1,856	20,760
Shares granted to Employees and Directors		$ 50	$ 600		$ 50	$ 600			$ 2		$ 50	$ 598
Restricted stock award (shares)							50,568
Restricted stock award	0						$ 4			(4)
Shares purchased and cancelled (shares)							(73,818)
Shares purchased and cancelled	(2,000)			(2,000)			$ (6)			(257)			(1,737)
Net income	1,997			2,422									2,422		(425)
Distributions to partners	(2,437)														(2,437)
Minimum pension liability, net	(24)			(24)										(24)
Unrealized loss on investment, net	972			972										972
Ending balance at Sep. 30, 2023	444,994			410,790			$ 1,896			66,220			343,002	(328)	34,204
Ending balance (shares) at Sep. 30, 2023							18,954,208
Beginning balance (shares) at Jun. 30, 2023							18,991,346
Beginning balance at Jun. 30, 2023	444,992			409,876			$ 1,900			66,078			342,610	(712)	35,116
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option grant compensation	16			16						16
Restricted stock compensation	255			255						255
Shares purchased and cancelled (shares)							(37,138)
Shares purchased and cancelled	(1,000)			(1,000)			$ (4)			(129)			(867)
Net income	1,099			1,259									1,259		(160)
Distributions to partners	(752)														(752)
Minimum pension liability, net	(8)			(8)										(8)
Unrealized loss on investment, net	392			392										392
Ending balance at Sep. 30, 2023	$ 444,994			410,790			$ 1,896			66,220			343,002	(328)	34,204
Ending balance (shares) at Sep. 30, 2023							18,954,208
Beginning balance (shares) at Dec. 31, 2023	18,968,448						18,968,448
Beginning balance at Dec. 31, 2023	$ 447,976			414,520			$ 1,897			66,706			345,882	35	33,456
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option grant compensation	58			58						58
Restricted stock compensation	955			955						955
Shares granted to Employees and Directors (shares)									19,356
Shares granted to Employees and Directors			$ 600			$ 600			$ 2			$ 598
Restricted stock award (shares)							42,670
Restricted stock award	0						$ 4			(4)
Net income	4,773			4,706									4,706		67
Contributions from partner	15,102														15,102
Distributions to partners	(2,406)														(2,406)
Minimum pension liability, net	(23)			(23)										(23)
Unrealized loss on investment, net	68			68										68
Ending balance at Sep. 30, 2024	$ 467,103			420,884			$ 1,903			68,313			350,588	80	46,219
Ending balance (shares) at Sep. 30, 2024	19,030,474						19,030,474
Beginning balance (shares) at Jun. 30, 2024							19,030,474
Beginning balance at Jun. 30, 2024	$ 451,148			419,132			$ 1,903			67,980			349,227	22	32,016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option grant compensation	19			19						19
Restricted stock compensation	314			314						314
Net income	1,379			1,361									1,361		18
Contributions from partner	15,102														15,102
Distributions to partners	(917)														(917)
Minimum pension liability, net	(8)			(8)										(8)
Unrealized loss on investment, net	66			66										66
Ending balance at Sep. 30, 2024	$ 467,103			$ 420,884			$ 1,903			$ 68,313			$ 350,588	$ 80	$ 46,219
Ending balance (shares) at Sep. 30, 2024	19,030,474						19,030,474