PER SHARE DATA (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 27, 2015
Earnings Per Share [Abstract]
Weighted average common shares issued (in shares)	7,542,043	7,524,767	7,518,939
Average treasury stock shares (in shares)	(480,225)	(480,225)	(480,225)
Weighted average number of shares outstanding, basic (in shares)	7,061,818	7,044,542	7,038,714
Dilutive effect of outstanding stock options (in shares)	0	0	74,625
Weighted average number of shares outstanding, diluted (in shares)	7,061,818	7,044,542	7,113,339
Options outstanding (in shares)	1,034,525	841,275	625,800	395,550	31,875
Share price (in dollars per share)	$ 27.23	$ 28.17	$ 29.29	$ 30.08