BUSINESS SEGMENT INFORMATION (Details) (USD $)	3 Months Ended												12 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 Industry Segment		Dec. 31, 2012 Segment Industry		Dec. 31, 2011 Industry Segment
BUSINESS SEGMENT INFORMATION [Abstract]
Number of industry in which entity operates													1		1		1
Number of reportable operating segments													3		3		3
Summary of key financial data [Abstract]
Net Sales to External Customers													$ 349,189,000		$ 286,594,000		$ 295,121,000
Net Sales	91,016,000	101,164,000	[1]	93,981,000	[1]	63,028,000	71,752,000	[2]	76,059,000	73,222,000	[2]	65,561,000	349,189,000	[3]	286,594,000	[3]	295,121,000
Income (loss) from operations													15,047,000		1,663,000		7,396,000
Total assets	308,050,000						275,189,000						308,050,000		275,189,000		276,911,000
Capital Expenditures													6,940,000		4,744,000		2,928,000
Depreciation and Amortization Expense													12,382,000		9,113,000		8,667,000
Restructuring charges							3,100,000						1,387,000		5,245,000		314,000
Litigation charges													(41,000)		(26,000)		(3,471,000)
Loss on disposal of assets															1,000,000
Pre-tax gain on sale of property													69,000		(183,000)		93,000
TRP [Member]
Summary of key financial data [Abstract]
Net Sales													66,100,000
Income (loss) from operations													10,900,000
Array [Member]
Summary of key financial data [Abstract]
Net Sales													2,100,000
Income (loss) from operations													(900,000)
Fibreco and Bel Power Europe Combined [Member]
Summary of key financial data [Abstract]
Net Sales													10,700,000		3,100,000
Income (loss) from operations													1,700,000		300,000
Interconnect [Member]
Summary of key financial data [Abstract]
Net Sales													111,653,000		109,245,000		107,346,000
Magnetics [Member]
Summary of key financial data [Abstract]
Net Sales													170,166,000		100,529,000		87,104,000
Modules [Member]
Summary of key financial data [Abstract]
Net Sales													55,967,000		66,663,000		90,475,000
Circuit protection [Member]
Summary of key financial data [Abstract]
Net Sales													11,403,000		10,157,000		10,196,000
North America [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers													116,548,000		126,469,000		134,804,000
Net Sales													128,472,000		138,966,000		149,114,000
Income (loss) from operations													(1,560,000)		1,336,000		9,026,000
Total assets	117,261,000						84,609,000						117,261,000		84,609,000		115,552,000
Capital Expenditures													2,064,000		2,455,000		1,121,000
Depreciation and Amortization Expense													4,282,000		4,081,000		4,046,000
Restructuring charges													1,000,000		4,500,000
Loss on disposal of assets															(300,000)
Asia [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers													193,647,000		128,319,000		126,941,000
Net Sales													225,151,000		167,756,000		177,815,000
Income (loss) from operations													15,356,000		(42,000)		(3,480,000)
Total assets	148,689,000						148,351,000						148,689,000		148,351,000		148,950,000
Capital Expenditures													4,551,000		2,003,000		1,733,000
Depreciation and Amortization Expense													6,540,000		4,076,000		4,137,000
Restructuring charges													200,000		600,000
Litigation charges																	3,500,000
Pre-tax gain on sale of property															200,000
Europe [Member]
Summary of key financial data [Abstract]
Net Sales to External Customers													38,994,000		31,806,000		33,376,000
Net Sales													40,742,000		33,329,000		34,597,000
Income (loss) from operations													1,251,000		369,000		1,850,000
Total assets	42,100,000						42,229,000						42,100,000		42,229,000		12,409,000
Capital Expenditures													325,000		286,000		74,000
Depreciation and Amortization Expense													1,560,000		956,000		484,000
Restructuring charges													200,000		100,000		300,000
Intergeographic revenues [Member]
Summary of key financial data [Abstract]
Net Sales													(45,176,000)		(53,457,000)		(66,405,000)
United States [Member]
Summary of key financial data [Abstract]
Net Sales													116,548,000		126,469,000		134,804,000
Macao [Member]
Summary of key financial data [Abstract]
Net Sales													193,647,000		128,319,000		126,941,000
Germany [Member]
Summary of key financial data [Abstract]
Net Sales													16,585,000		14,165,000		17,937,000
United Kingdom [Member]
Summary of key financial data [Abstract]
Net Sales													16,538,000		13,203,000		11,927,000
Italy [Member]
Summary of key financial data [Abstract]
Net Sales													3,252,000		1,083,000		0
Sweden [Member]
Summary of key financial data [Abstract]
Net Sales													4,000		57,000		0
Czech Republic [Member]
Summary of key financial data [Abstract]
Net Sales													$ 2,615,000		$ 3,298,000		$ 3,512,000

[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.