CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - 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, 2019		7,520,740
Beginning balance at Dec. 31, 2019	$ 154,982	$ 41,782	$ 51,487	$ 76,583	$ (2,777)	$ (12,115)	$ 22
Increase (Decrease) in Shareholders' Equity
Net income	15,224			15,206			18
Other comprehensive income (loss)	1,895				1,895
Stock-based compensation recognized in earnings	854		854
Dividends declared	(9,020)			(9,020)
Common shares issued for employee stock purchase plan (in shares)		3,972
Common shares issued for employee stock purchase plan	86	$ 21	65
Common shares issued for director compensation plan (in shares)		7,864
Common shares issued for director compensation plan	161	$ 44	117
Distributions to noncontrolling interest	(36)						(36)
Ending balance (in shares) at Dec. 31, 2020		7,532,576
Ending balance at Dec. 31, 2020	164,146	$ 41,847	52,523	82,769	(882)	(12,115)	4
Increase (Decrease) in Shareholders' Equity
Net income	16,048			16,033			15
Other comprehensive income (loss)	(230)				(230)
Stock-based compensation recognized in earnings	960		960
Dividends declared	(9,041)			(9,041)
Common shares issued for employee stock purchase plan (in shares)		3,850
Common shares issued for employee stock purchase plan	87	$ 21	66
Common shares issued for director compensation plan (in shares)		13,846
Common shares issued for director compensation plan	321	$ 77	244
Distributions to noncontrolling interest	(17)						(17)
Noncontrolling interest purchase	0		2				(2)
Ending balance (in shares) at Dec. 31, 2021		7,550,272
Ending balance at Dec. 31, 2021	172,274	$ 41,945	53,795	89,761	(1,112)	(12,115)	0
Increase (Decrease) in Shareholders' Equity
Net income	17,422			17,422
Other comprehensive income (loss)	(12,846)				(12,846)
Cash settlement of options	(1,074)		(1,074)
Stock-based compensation recognized in earnings	1,231		1,231
Dividends declared	(9,036)			(9,036)
Common shares issued for employee stock purchase plan (in shares)		3,617
Common shares issued for employee stock purchase plan	82	$ 20	62
Common shares issued for director compensation plan (in shares)		12,921
Common shares issued for director compensation plan	312	$ 74	238
Purchase of treasury stock (30,000 shares)	(700)					(700)
Ending balance (in shares) at Dec. 31, 2022		7,566,810
Ending balance at Dec. 31, 2022	$ 167,665	$ 42,039	$ 54,252	$ 98,147	$ (13,958)	$ (12,815)	$ 0