DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended												12 Months Ended					3 Months Ended												12 Months Ended					3 Months Ended												12 Months Ended									0 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2013	Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2013 Segment		Dec. 31, 2012 Segment		Dec. 31, 2011 Segment	Dec. 31, 2013 Class A [Member]	Sep. 30, 2013 Class A [Member]		Jun. 30, 2013 Class A [Member]		Mar. 31, 2013 Class A [Member]	Dec. 31, 2012 Class A [Member]		Sep. 30, 2012 Class A [Member]	Jun. 30, 2012 Class A [Member]		Mar. 31, 2012 Class A [Member]	Dec. 31, 2013 Class A [Member]		Dec. 31, 2012 Class A [Member]		Dec. 31, 2011 Class A [Member]	Dec. 31, 2013 Class B [Member]	Sep. 30, 2013 Class B [Member]		Jun. 30, 2013 Class B [Member]		Mar. 31, 2013 Class B [Member]	Dec. 31, 2012 Class B [Member]		Sep. 30, 2012 Class B [Member]	Jun. 30, 2012 Class B [Member]		Mar. 31, 2012 Class B [Member]	Dec. 31, 2013 Class B [Member]		Dec. 31, 2012 Class B [Member]		Dec. 31, 2011 Class B [Member]	Dec. 31, 2013 Machinery and Equipment [Member] Minimum [Member]	Dec. 31, 2013 Machinery and Equipment [Member] Maximum [Member]	Dec. 31, 2013 Buildings and Leasehold Improvements [Member] Minimum [Member]	Dec. 31, 2013 Buildings and Leasehold Improvements [Member] Maximum [Member]	Mar. 09, 2012 GigaCom Interconnect [Member]	Dec. 31, 2013 GigaCom Interconnect [Member]	Dec. 31, 2012 GigaCom Interconnect [Member]	Sep. 12, 2012 Powerbox [Member]	Jul. 31, 2012 Fibreco [Member]	Aug. 20, 2013 Array [Member]	Mar. 29, 2013 TRP [Member]
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Number of reportable segments													3		3		3
Acquired tax assets and liabilities [Line Items]
Acquisition date																																																								Mar. 09, 2012			Sep. 12, 2012	Jul. 31, 2012	Aug. 20, 2013	Mar. 29, 2013
Acquisition of issued and outstanding capital stock (in hundredths)																																																								100.00%			100.00%	100.00%	100.00%	100.00%
Allowance for doubtful accounts	$ 941,000						$ 743,000						$ 941,000		$ 743,000
Other-than-temporary impairment charge															800,000
Net realized gains (losses) on sales of investments													100,000		(100,000)		100,000
Change in Chinese Renminbi foreign currency exchange rate													2.00%
Net currency exchange (losses) gains													(600,000)		600,000
Foreign currency translation gains (losses)													977,000		281,000		(236,000)
Warranty period for workmanship defects													12 months
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life																																																				1 year	13 years	2 years	39 years
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	7,397,000	7,380,000	[1]	1,689,000	[1]	(558,000)	(2,432,000)	[2]	2,492,000	1,441,000	[2]	872,000	15,908,000	[3]	2,373,000	[3]	3,764,000													2,868,000		372,000		620,000													13,040,000		2,001,000		3,144,000
Less Dividends declared																														522,000		522,000		522,000													2,576,000		2,697,000		2,690,000
Undistributed earnings (loss)													12,810,000		(846,000)		552,000													2,346,000		(150,000)		98,000													10,464,000		(696,000)		454,000
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Undistributed earnings (loss)													12,810,000		(846,000)		552,000													2,346,000		(150,000)		98,000													10,464,000		(696,000)		454,000
Net earnings allocation basic and diluted [Abstract]
Net earnings	7,397,000	7,380,000	[1]	1,689,000	[1]	(558,000)	(2,432,000)	[2]	2,492,000	1,441,000	[2]	872,000	15,908,000	[3]	2,373,000	[3]	3,764,000													2,868,000		372,000		620,000													13,040,000		2,001,000		3,144,000
Weighted-average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)																														2,174,912		2,174,912		2,174,912													9,239,646		9,624,578		9,597,661
Earnings per share [Abstract]
Common share - basic and diluted (in dollars per share)																		$ 0.61	$ 0.62	[1]	$ 0.14	[1]	$ (0.05)	$ (0.21)	[2]	$ 0.20	$ 0.11	[2]	$ 0.07	$ 1.32	[3]	$ 0.17	[3]	$ 0.28	$ 0.65	$ 0.65	[1]	$ 0.15	[1]	$ (0.05)	$ (0.21)	[2]	$ 0.21	$ 0.12	[2]	$ 0.08	$ 1.41	[3]	$ 0.21	[3]	$ 0.33
Research and Development Costs													14,100,000		12,400,000		12,000,000																																								1,000,000	600,000
Impairment charges related to property, plant and equipment															1,400,000
Carrying value of the building and land															1,000,000
Asset write-downs related to property, plant and equipment							$ 300,000								$ 300,000

[1] The net earnings for the quarters ended June 30, 2013 and September 30, 2013 have been restated to include the effects of measurement period adjustments related to the acquisitions of TRP and Array. These measurement period adjustments reduced the previously-reported net earnings by $0.7 million and $0.5 million for the quarters ended June 30, 2013 and September 30, 2013, respectively, and primarily related to the step-up of inventory to fair value, and higher depreciation and amortization expense related to the appraised fair values of property, plant and equipment, and the various intangible assets as further described in Note 2.

[2] The net loss for the quarter ended December 31, 2012 includes $3.1 million of restructuring charges primarily related to severance charges and the write-down of assets associated with the closure of the Company’s Vinita, Oklahoma manufacturing facility.

[3] Quarterly amounts of earnings per share may not agree to the total for the year due to rounding.