CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification out of AOCI
Sales	$ 90,175	$ 84,991	$ 78,197	$ 64,557	$ 86,794	$ 67,211	$ 70,186	$ 67,822	$ 317,920	$ 292,013	$ 315,249
Other expense, net									365	(310)	(632)
Income from continuing operations before income taxes									8,683	3,067	4,438
Income taxes									(2,837)	(1,843)	(1,828)
Net income	$ 3,173	$ 2,199	$ 2,522	$ (2,048)	$ 3,707	$ (1,383)	$ 145	$ (1,245)	5,846	1,224	2,610
Total before tax									(2,303)	(3,770)	(2,874)
Unrealized gain (loss) on cash flow hedges
Reclassification out of AOCI
Total before tax									411	(75)	(212)
Unrealized gain (loss) on cash flow hedges | Amount reclassified from AOCI
Reclassification out of AOCI
Sales									386	27	(120)
Other expense, net									25	(102)	(92)
Income from continuing operations before income taxes									411	(75)	(212)
Income taxes									125	(16)	36
Net income									536	(91)	(176)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Reclassification out of AOCI
Total before tax									311	311	318
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent
Reclassification out of AOCI
Total before tax									0	253	258
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Reclassification out of AOCI
Total before tax									(3,740)	(3,626)	(3,222)
Accumulated Defined Benefit Plans Adjustment, Settlement Loss Attributable To Parent
Reclassification out of AOCI
Total before tax									(118)	(633)	(16)
Retirement plans related adjustments
Reclassification out of AOCI
Total before tax									(3,547)	(3,695)	(2,662)
Tax benefit									376	426	187
Net of tax									(3,171)	(3,269)	(2,475)
Foreign currency translation adjustment:
Reclassification out of AOCI
Total before tax									833	0	0
Foreign currency translation adjustment: | Amount reclassified from AOCI
Reclassification out of AOCI
Other expense, net									833	0	0
Income from continuing operations before income taxes									833	0	0
Income taxes									0	0	0
Net income									$ 833	$ 0	$ 0