CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Directors	Employees	Total Share holders’ Equity	Total Share holders’ Equity Directors	Total Share holders’ Equity Employees	Common Stock	Common Stock Directors	Common Stock Employees	Capital in Excess of Par Value	Capital in Excess of Par Value Directors	Capital in Excess of Par Value Employees	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	33			33						33
Restricted stock compensation	518			518						518
Shares granted to Employees and Directors (shares)								20,760	1,856
Shares granted to Employees and Directors		$ 600	$ 50		$ 600	$ 50		$ 2			$ 598	$ 50
Restricted stock award (shares)							50,568
Restricted stock award	0						$ 4			(4)
Shares purchased and cancelled (shares)							(36,680)
Shares purchased and cancelled	(1,000)			(1,000)			$ (2)			(128)			(870)
Net income	898			1,163									1,163		(265)
Distributions to partners	(1,685)														(1,685)
Minimum pension liability,net	(16)			(16)										(16)
Unrealized loss on investment, net	580			580										580
Ending balance at Jun. 30, 2023	444,992			409,876			$ 1,900			66,078			342,610	(712)	35,116
Ending balance (shares) at Jun. 30, 2023							18,991,346
Beginning balance (shares) at Mar. 31, 2023							19,007,266
Beginning balance at Mar. 31, 2023	445,185			409,211			$ 1,900			65,331			342,882	(902)	35,974
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option grant compensation	16			16						16
Restricted stock compensation	261			261						261
Shares granted to Employees and Directors (shares)								20,760
Shares granted to Employees and Directors		600			600			$ 2			598
Shares purchased and cancelled (shares)							(36,680)
Shares purchased and cancelled	(1,000)			(1,000)			$ (2)			(128)			(870)
Net income	492			598									598		(106)
Distributions to partners	(752)														(752)
Minimum pension liability,net	(16)			(16)										(16)
Unrealized loss on investment, net	206			206										206
Ending balance at Jun. 30, 2023	$ 444,992			409,876			$ 1,900			66,078			342,610	(712)	35,116
Ending balance (shares) at Jun. 30, 2023							18,991,346
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	39			39						39
Restricted stock compensation	641			641						641
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	3,394			3,345									3,345		49
Distributions to partners	(1,489)														(1,489)
Minimum pension liability,net	(15)			(15)										(15)
Unrealized loss on investment, net	2			2										2
Ending balance at Jun. 30, 2024	$ 451,148			419,132			$ 1,903			67,980			349,227	22	32,016
Ending balance (shares) at Jun. 30, 2024	19,030,474						19,030,474
Beginning balance (shares) at Mar. 31, 2024							19,000,600
Beginning balance at Mar. 31, 2024	$ 448,871			416,133			$ 1,900			67,023			347,183	27	32,738
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option grant compensation	20			20						20
Restricted stock compensation	340			340						340
Shares granted to Employees and Directors (shares)							19,356
Shares granted to Employees and Directors	600			600			$ 2			598
Restricted stock award (shares)							10,518
Restricted stock award	0						$ 1			(1)
Net income	2,059			2,044									2,044		15
Distributions to partners	(737)														(737)
Minimum pension liability,net	(7)			(7)										(7)
Unrealized loss on investment, net	2			2										2
Ending balance at Jun. 30, 2024	$ 451,148			$ 419,132			$ 1,903			$ 67,980			$ 349,227	$ 22	$ 32,016
Ending balance (shares) at Jun. 30, 2024	19,030,474						19,030,474