EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net Income (Loss)	$ 31,576	$ 30,807	$ 26,224
Denominator:
Denominator for Basic Earnings Per Share Weighted-Average Shares	16,785	16,770	17,029
Effects of Dilutive Securities Stock Compensation Plans	37	57	43
Denominator for Diluted Earnings Per Share Adjusted Weighted-Average Shares and Assumed Conversions	16,822	16,827	17,072
Basic Earnings Per Share (in dollers per shares)	$ 1.88	$ 1.84	$ 1.54
Diluted Earnings Per Share (in dollers per shares)	$ 1.88	$ 1.83	$ 1.54