QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 67,185	$ 65,916	$ 58,206	$ 61,387	$ 66,994	$ 64,675	$ 58,455	$ 63,073	$ 252,694	$ 253,197
Gross margin	24,132	22,400	19,532	20,965	23,346	19,512	18,164	19,748	87,029	80,769
Net income	3,608	5,045	2,649	3,251	4,396	2,235	1,459	1,496	14,553	9,586
Dividends paid	$ 891	$ 889	$ 889	$ 815	$ 814	$ 819	$ 819	$ 818	$ 3,484	$ 3,269
Net (loss) income per common share:
Basic (in Dollars per share)	$ 0.48	$ 0.68	$ 0.36	$ 0.44	$ 0.59	$ 0.30	$ 0.20	$ 0.20	$ 1.96	$ 1.29
Diluted (in Dollars per share)	$ 0.48	$ 0.67	$ 0.36	$ 0.44	$ 0.59	$ 0.30	$ 0.20	$ 0.20	$ 1.95	$ 1.29