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, 2018		7,517,546
Beginning balance at Dec. 31, 2018	$ 143,544	$ 41,763	$ 50,737	$ 69,787	$ (6,636)	$ (12,115)	$ 8
Increase (Decrease) in Shareholders' Equity
Net income	15,686			15,672			14
Other comprehensive income (loss)	3,859				3,859
Stock-based compensation recognized in earnings	680		680
Dividends declared	(8,876)			(8,876)
Common shares issued for employee stock purchase plan (in shares)		3,414
Common shares issued for employee stock purchase plan	89	$ 19	70
Stock split fractional shares (in shares)		(220)
Ending balance (in shares) at Dec. 31, 2019		7,520,740
Ending 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