CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Cumulative effect of change in accounting principle Retained Earnings	Cumulative effect of change in accounting principle	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Beginning balance at Dec. 31, 2021			$ 5,151	$ 25,008	$ 47,298	$ (3,365)	$ (2,802)	$ 71,290
Beginning balance, shares at Dec. 31, 2021			4,988,542
Net Income (Loss)					7,064			7,064
Other comprehensive income (loss)						(38,502)		(38,502)
Cash dividends					(4,401)			(4,401)
Stock-based compensation				176				176
Purchase of treasury stock							(3)	$ (3)
Purchase of treasury stock, shares			(995)					(170)
Treasury stock issued for stock plans				(198)			267	$ 69
Treasury stock issued for stock plans, shares			15,512
Ending balance at Dec. 31, 2022	$ (854)	$ (854)	$ 5,151	24,986	49,961	(41,867)	(2,538)	$ 35,693
Ending balance, shares at Dec. 31, 2022			5,003,059					5,003,059
Net Income (Loss)					1,733			$ 1,733
Other comprehensive income (loss)						779		779
Cash dividends					(1,101)			(1,101)
Stock-based compensation				(32)				(32)
Purchase of treasury stock							(9)	(9)
Purchase of treasury stock, shares			(569)
Treasury stock issued for stock plans				(195)			195
Treasury stock issued for stock plans, shares			11,409
Ending balance at Mar. 31, 2023			$ 5,151	24,823	49,739	(41,088)	(2,352)	$ 36,273
Ending balance, shares at Mar. 31, 2023			5,013,899					5,013,899
Beginning balance at Dec. 31, 2022	$ (854)	$ (854)	$ 5,151	24,986	49,961	(41,867)	(2,538)	$ 35,693
Beginning balance, shares at Dec. 31, 2022			5,003,059					5,003,059
Net Income (Loss)					6,596			$ 6,596
Other comprehensive income (loss)						3,227		3,227
Cash dividends					(4,406)			(4,406)
Stock-based compensation				143				143
Purchase of treasury stock							(324)	$ (324)
Purchase of treasury stock, shares			(27,569)					(27,569)
Treasury stock issued for stock plans				(205)			267	$ 62
Treasury stock issued for stock plans, shares			15,639
Ending balance at Dec. 31, 2023			$ 5,151	24,924	51,297	(38,640)	(2,595)	$ 40,137
Ending balance, shares at Dec. 31, 2023			4,991,129					4,991,129
Beginning balance at Mar. 31, 2023			$ 5,151	24,823	49,739	(41,088)	(2,352)	$ 36,273
Beginning balance, shares at Mar. 31, 2023			5,013,899					5,013,899
Net Income (Loss)					1,398			$ 1,398
Other comprehensive income (loss)						(925)		(925)
Cash dividends					(1,102)			(1,102)
Stock-based compensation				(39)				(39)
Treasury stock issued for stock plans				(10)			72	62
Treasury stock issued for stock plans, shares			4,230
Ending balance at Jun. 30, 2023			$ 5,151	24,852	50,035	(42,013)	(2,280)	$ 35,745
Ending balance, shares at Jun. 30, 2023			5,018,129					5,018,129
Net Income (Loss)					1,791			$ 1,791
Other comprehensive income (loss)						412		412
Cash dividends					(1,104)			(1,104)
Stock-based compensation				(35)				(35)
Ending balance at Sep. 30, 2023			$ 5,151	$ 24,887	$ 50,722	$ (41,601)	$ (2,280)	$ 36,879
Ending balance, shares at Sep. 30, 2023			5,018,129					5,018,129