CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE LOSS	TREASURY STOCK	NON-CONTROLLING INTEREST
Beginning balance (in shares) at Dec. 31, 2020		7,532,576
Beginning balance at Dec. 31, 2020	$ 164,146	$ 41,847	$ 52,523	$ 82,769	$ (882)	$ (12,115)	$ 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,169			11,154			15
Other comprehensive loss	(1,100)				(1,100)
Stock-based compensation	754		754
Dividends declared	(6,777)			(6,777)
Common shares issued for employee stock purchase plan (in shares)		2,873
Common shares issued for employee stock purchase plan	65	$ 16	49
Director compensation plan (in shares)		10,473
Director Compensation Plan	240	$ 58	182
Distributions to noncontrolling interest	(16)						(16)
Ending balance (in shares) at Sep. 30, 2021		7,545,922
Ending balance at Sep. 30, 2021	168,481	$ 41,921	53,508	87,146	(1,982)	(12,115)	3
Beginning balance (in shares) at Jun. 30, 2021		7,541,627
Beginning balance at Jun. 30, 2021	166,835	$ 41,897	53,205	85,281	(1,438)	(12,115)	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,129			4,125			4
Other comprehensive loss	(544)				(544)
Stock-based compensation	227		227
Dividends declared	(2,260)			(2,260)
Common shares issued for employee stock purchase plan (in shares)		889
Common shares issued for employee stock purchase plan	20	$ 5	15
Director compensation plan (in shares)		3,406
Director Compensation Plan	80	$ 19	61
Distributions to noncontrolling interest	(6)						(6)
Ending balance (in shares) at Sep. 30, 2021		7,545,922
Ending balance at Sep. 30, 2021	168,481	$ 41,921	53,508	87,146	(1,982)	(12,115)	3
Beginning balance (in shares) at Dec. 31, 2021		7,550,272
Beginning balance at Dec. 31, 2021	172,274	$ 41,945	53,795	89,761	(1,112)	(12,115)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,913			12,913
Other comprehensive loss	(13,457)				(13,457)
Stock-based compensation	1,004		1,004
Cash settlement of options	(1,074)		(1,074)
Dividends declared	(6,778)			(6,778)
Common shares issued for employee stock purchase plan (in shares)		2,960
Common shares issued for employee stock purchase plan	67	$ 17	50
Director compensation plan (in shares)		9,968
Director Compensation Plan	240	$ 57	183
Purchase of treasury stock	(700)					(700)
Ending balance (in shares) at Sep. 30, 2022		7,563,200
Ending balance at Sep. 30, 2022	164,489	$ 42,019	53,958	95,896	(14,569)	(12,815)	0
Beginning balance (in shares) at Jun. 30, 2022		7,559,165
Beginning balance at Jun. 30, 2022	166,054	$ 41,995	53,651	92,903	(9,680)	(12,815)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,250			5,250
Other comprehensive loss	(4,889)				(4,889)
Stock-based compensation	236		236
Dividends declared	(2,257)			(2,257)
Common shares issued for employee stock purchase plan (in shares)		1,057
Common shares issued for employee stock purchase plan	23	$ 6	17
Director compensation plan (in shares)		2,978
Director Compensation Plan	72	$ 18	54
Ending balance (in shares) at Sep. 30, 2022		7,563,200
Ending balance at Sep. 30, 2022	$ 164,489	$ 42,019	$ 53,958	$ 95,896	$ (14,569)	$ (12,815)	$ 0