ACQUISITIONS (Details)	12 Months Ended				12 Months Ended							12 Months Ended							12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Trademarks [Member] USD ($)	Dec. 31, 2012 Technology [Member] USD ($)	Dec. 31, 2012 Customer Relationships [Member] USD ($)	Dec. 31, 2012 Noncompete Agreements [Member] USD ($)	Dec. 31, 2012 Machinery and Equipment [Member] USD ($)	Dec. 31, 2012 Acquisition Date Fair Values [Member] USD ($)	Dec. 31, 2012 Measurement Period Adjustments [Member] USD ($)	Dec. 31, 2012 Acquisition Date Fair Values (As adjusted) [Member] USD ($)	Dec. 31, 2012 Class A [Member] USD ($)	Dec. 31, 2011 Class A [Member] USD ($)	Dec. 31, 2012 Class B [Member] USD ($)	Dec. 31, 2011 Class B [Member] USD ($)	Dec. 31, 2012 GigaCom Interconnect [Member]	Mar. 09, 2012 GigaCom Interconnect [Member] USD ($)	Mar. 09, 2012 GigaCom Interconnect [Member] GBP (£)	Dec. 31, 2012 Fibreco [Member] USD ($)	Jul. 31, 2012 Fibreco [Member] USD ($)	Jul. 31, 2012 Fibreco [Member] GBP (£)	Dec. 31, 2012 Powerbox Italy [Member] USD ($)	Sep. 12, 2012 Powerbox Italy [Member] USD ($)	Dec. 31, 2012 Powerbox Italy [Member] Class B [Member]	Sep. 12, 2012 Powerbox Italy [Member] Class B [Member] USD ($)	Dec. 31, 2010 Cinch Acquisition [Member] USD ($)	Jan. 29, 2010 Cinch Acquisition [Member] USD ($)	Jan. 29, 2010 Cinch Acquisition [Member] North America [Member] USD ($)	Jan. 29, 2010 Cinch Acquisition [Member] Europe [Member] USD ($)	Nov. 28, 2012 Transpower acquisition [Member] USD ($)
Acquired tax assets and liabilities [Line Items]
Acquisition date																Mar. 09, 2012			Jul. 31, 2012			Sep. 12, 2012				Jan. 29, 2010
Acquisition of issued and outstanding capital stock (in hundredths)																	100.00%	100.00%		100.00%	100.00%		100.00%				100.00%
Cash paid in exchange of net assets acquired									$ 22,138,000	$ 263,000	$ 22,401,000						$ 2,700,000	£ 1,700,000		$ 13,700,000	£ 8,700,000		$ 3,000,000				$ 39,700,000
Liabilities assumed																											800,000
Goodwill arise in acquisition									17,965,000	(8,241,000)	9,724,000																2,300,000	1,200,000	1,100,000
Cash acquired from acquisition	2,991,000	0	57,000																2,700,000			200,000
Number of restricted shares granted for acquisition (in shares)																								30,000
Compensation expense of grant date fair value of restricted shares																									600,000
Acquisition-related costs	800,000																									300,000
Assets acquired [Abstract]
Cash and cash equivalents									2,991,000	0	2,991,000
Accounts receivable									3,750,000	224,000	3,974,000
Inventories									1,061,000	(16,000)	1,045,000
Other current assets									90,000	0	90,000
Property, plant and equipment								800,000	502,000	248,000	750,000
Intangible assets	10,388,000			1,264,000	5,464,000	3,142,000	518,000		30,000	10,358,000	10,388,000
Total identifiable assets									8,424,000	10,814,000	19,238,000
Liabilities assumed [Abstract]
Accounts payable									(1,702,000)	0	(1,702,000)
Accrued expenses									(1,736,000)	0	(1,736,000)
Notes Payable									(216,000)	0	(216,000)
Income taxes payable									(264,000)	(60,000)	(324,000)
Deferred income tax liability, current									(70,000)	0	(70,000)
Deferred income tax liability, noncurrent									0	(2,297,000)	(2,297,000)
Other long-term liabilities									(216,000)	0	(216,000)
Total liabilities assumed									(4,204,000)	(2,357,000)	(6,561,000)
Net identifiable assets acquired									4,220,000	8,457,000	12,677,000
Goodwill									17,965,000	(8,241,000)	9,724,000																2,300,000	1,200,000	1,100,000
Fair value of net assets acquired									22,185,000	216,000	22,401,000
Consideration transferred [Abstract]
Cash Paid									22,138,000	263,000	22,401,000						2,700,000	1,700,000		13,700,000	8,700,000		3,000,000				39,700,000
Deferred consideration									47,000	(47,000)	0
Fair value of consideration transferred									22,185,000	216,000	22,401,000
Purchase price allocations practicable period maximum	1 year
Property, plant and equipment, weighted average life								5 years
Identifiable intangible assets, weighted-average life					20 years	16 years	2 years
Acquisitions contributed revenues	3,200,000
Net earnings contributed by acquisition	200,000
Unaudited Pro forma Consolidated Results of Operations
Revenue	293,948,000	304,189,000
Net earnings	3,465,000	4,623,000
Earnings per common share - basic and diluted (in dollars per share)												$ 0.26	$ 0.36	$ 0.30	$ 0.40
Agreed purchase price																														$ 22,400,000