GOODWILL AND OTHER INTANGIBLE ASSETS - Other intangible assets - (Details) - USD ($)		9 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Other intangible assets:
Cost		$ 11,273,000	$ 11,297,000
Accumulated amortization		4,004,000	3,497,000
Net book value		7,269,000	7,800,000
Customer Relationships [Member]
Other intangible assets:
Cost	[1]	6,813,000	6,821,000
Accumulated amortization	[1]	2,558,000	2,135,000
Net book value	[1]	$ 4,255,000	$ 4,686,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		8 years 7 months 6 days	9 years 3 months 18 days
Trademarks and trade names one [Member]
Other intangible assets:
Cost	[1]	$ 2,296,000	$ 2,308,000
Accumulated amortization	[1]	0	0
Net book value	[1]	$ 2,296,000	$ 2,308,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 years 9 months 18 days	12 years 6 months
Trademarks and Trade Names Two [Member]
Other intangible assets:
Cost		$ 200,000	$ 200,000
Accumulated amortization		42,000	32,000
Net book value		158,000	168,000
Engineering drawings [Member]
Other intangible assets:
Cost		330,000	330,000
Accumulated amortization		221,000	202,000
Net book value		$ 109,000	$ 128,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		7 years 4 months 24 days	7 years 8 months 12 days
Non-compete [Member]
Other intangible assets:
Cost	[1]	$ 229,000	$ 233,000
Accumulated amortization	[1]	223,000	223,000
Net book value	[1]	$ 6,000	$ 10,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year 6 months	2 years 3 months 18 days
Patents [Member]
Other intangible assets:
Cost		$ 1,405,000	$ 1,405,000
Accumulated amortization		960,000	905,000
Net book value		$ 445,000	$ 500,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		7 years 3 months 18 days	7 years 10 months 24 days

[1] (1)A portion of these intangibles are maintained in a foreign currency and are therefore subject to foreign exchange rate fluctuations.