DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012	Mar. 09, 2012	Sep. 12, 2012	Jul. 31, 2012	Aug. 20, 2013	Mar. 29, 2013	Jun. 19, 2014	Jul. 25, 2014
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Number of reportable segments									3
Foreign Currency Translation [Abstract]
Change in Chinese Renminbi foreign currency exchange rate									0.80%
Net currency exchange (losses) gains									$ 4,300,000	$ (600,000)	$ 600,000
Foreign currency translation gains (losses)									(11,269,000)	977,000	281,000
Numerator [Abstract]
Net earnings	2,020,000	1,507,000	3,065,000	2,503,000	7,397,000	7,380,000	1,689,000	(558,000)	9,095,000	15,908,000	2,373,000
Undistributed earnings (loss)									5,908,000	12,810,000	(846,000)
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)									5,908,000	12,810,000	(846,000)
Net earnings allocation - basic and diluted [Abstract]
Net earnings	2,020,000	1,507,000	3,065,000	2,503,000	7,397,000	7,380,000	1,689,000	(558,000)	9,095,000	15,908,000	2,373,000
Net earnings per share: [Abstract]
Research and development costs									21,500,000	14,100,000	12,400,000
Class A [Member]
Numerator [Abstract]
Net earnings									1,580,000	2,868,000	372,000
Less dividends declared									522,000	522,000	522,000
Undistributed earnings (loss)									1,058,000	2,346,000	(150,000)
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)									1,058,000	2,346,000	(150,000)
Net earnings allocation - basic and diluted [Abstract]
Net earnings									1,580,000	2,868,000	372,000
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)									2,175	2,175	2,175
Net earnings per share: [Abstract]
Common share - basic and diluted (in dollars per share)	$ 0.16	$ 0.12	$ 0.25	$ 0.20	$ 0.61	$ 0.62	$ 0.14	$ (0.05)	$ 0.73	$ 1.32	$ 0.17
Class B [Member]
Earnings Per Share [Line Items]
Dividend rate Class B common stock in excess of dividend rate of Class A common stock (in hundredths)									5.00%	5.00%	5.00%
Undistributed earning allocation rate of Class B common stock in excess of Class A common stock (in hundredths)									5.00%	5.00%	5.00%
Numerator [Abstract]
Net earnings									7,515,000	13,040,000	2,001,000
Less dividends declared									2,665,000	2,576,000	2,697,000
Undistributed earnings (loss)									4,850,000	10,464,000	(696,000)
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)									4,850,000	10,464,000	(696,000)
Net earnings allocation - basic and diluted [Abstract]
Net earnings									$ 7,515,000	$ 13,040,000	$ 2,001,000
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)									9,491	9,240	9,625
Net earnings per share: [Abstract]
Common share - basic and diluted (in dollars per share)	$ 0.17	$ 0.13	$ 0.27	$ 0.22	$ 0.65	$ 0.65	$ 0.15	$ (0.05)	$ 0.79	$ 1.41	$ 0.21
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									1 year
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									15 years
Buildings and Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									1 year
Buildings and Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life									39 years
GigaCom Interconnect [Member]
Business Acquisition [Line Items]
Acquisition date												Mar. 09, 2012
Acquisition of issued and outstanding capital stock (in hundredths)												100.00%
Powerbox [Member]
Business Acquisition [Line Items]
Acquisition date													Sep. 12, 2012
Acquisition of issued and outstanding capital stock (in hundredths)													100.00%
Fibreco [Member]
Business Acquisition [Line Items]
Acquisition date														Jul. 31, 2012
Acquisition of issued and outstanding capital stock (in hundredths)														100.00%
Array [Member]
Business Acquisition [Line Items]
Acquisition date															Aug. 20, 2013
Acquisition of issued and outstanding capital stock (in hundredths)															100.00%
TRP [Member]
Business Acquisition [Line Items]
Acquisition date																Mar. 29, 2013
Acquisition of issued and outstanding capital stock (in hundredths)																100.00%
Power Solutions [Member]
Business Acquisition [Line Items]
Acquisition date																	Jun. 19, 2014
Acquisition of issued and outstanding capital stock (in hundredths)																	100.00%
Emerson [Member]
Business Acquisition [Line Items]
Acquisition date																		Jul. 25, 2014
Acquisition of issued and outstanding capital stock (in hundredths)																		100.00%