ACQUISITIONS (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended						3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Mar. 31, 2014 Acquisition Date Fair Values (As finalized) [Member]	Jun. 30, 2014 Class A [Member]	Jun. 30, 2013 Class A [Member]	Jun. 30, 2014 Class A [Member]	Jun. 30, 2013 Class A [Member]	Jun. 30, 2014 Class B [Member]	Jun. 30, 2013 Class B [Member]	Jun. 30, 2014 Class B [Member]	Jun. 30, 2013 Class B [Member]	Jun. 19, 2014 Power Solutions [Member]	Jun. 19, 2014 Power Solutions [Member]		Jun. 30, 2014 Power Solutions [Member]	Jun. 30, 2013 Power Solutions [Member]	Jun. 30, 2014 Power Solutions [Member]	Jun. 30, 2013 Power Solutions [Member]	Jun. 30, 2014 Power Solutions [Member] Class A [Member]	Jun. 30, 2013 Power Solutions [Member] Class A [Member]	Jun. 30, 2014 Power Solutions [Member] Class A [Member]	Jun. 30, 2013 Power Solutions [Member] Class A [Member]	Jun. 30, 2014 Power Solutions [Member] Class B [Member]	Jun. 30, 2013 Power Solutions [Member] Class B [Member]	Jun. 30, 2014 Power Solutions [Member] Class B [Member]	Jun. 30, 2013 Power Solutions [Member] Class B [Member]	Mar. 29, 2013 TRP [Member]	Mar. 29, 2013 TRP [Member] Acquisition Date Fair Values [Member]	Mar. 29, 2013 TRP [Member] Measurement Period Adjustments [Member]	Aug. 20, 2013 Array [Member]	Aug. 20, 2013 Array [Member] Acquisition Date Fair Values [Member]	Aug. 20, 2013 Array [Member] Measurement Period Adjustments [Member]	Jun. 30, 2014 2013 Acquired Companies [Member]	Jun. 30, 2013 2013 Acquired Companies [Member]	Jun. 30, 2014 2013 Acquired Companies [Member]	Jun. 30, 2013 2013 Acquired Companies [Member]
Acquired assets and liabilities [Line Items]
Payment for acquisitions, net of cash acquired			$ 109,879,000	$ 20,932,000												$ 110,000,000														$ 21,000,000			$ 10,000,000
Acquisition-related costs	400,000		400,000															1,000,000		1,000,000																100,000	300,000	100,000	700,000
Percentages of owned joint venture investment (in hundredths)																49.00%
Revenues	99,439,000	93,981,000	182,085,000	157,009,000														7,200,000		7,200,000																19,700,000	22,200,000	37,600,000	22,200,000
Net earnings (loss)	3,065,000	1,689,000	5,568,000	1,131,000			545,000	299,000	987,000	187,000	2,520,000	1,390,000	4,581,000	944,000				(800,000)		(800,000)																3,700,000	3,300,000	4,800,000	3,300,000
Acquisition-related costs excluded from pro forma net earnings																				10,200,000
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax																				6,900,000
Nonrecurring expense related to fair value adjustments excluded from pro forma net earnings																			1,800,000		4,400,000
Fair value adjustments excluded from pro form net earnings after tax																			1,100,000		2,700,000
Assets acquired [Abstract]
Cash and cash equivalents						8,388,000										20,913,000														8,388,000	8,388,000	0	0	0	0
Accounts receivable						12,535,000										29,388,000														11,580,000	11,541,000	(39,000)	994,000	994,000	0
Inventories	33,400,000		33,400,000			8,348,000										33,156,000	[1]													6,258,000	7,355,000	1,097,000	2,588,000	993,000	(1,595,000)
Other current assets						2,047,000										5,387,000														1,953,000	1,619,000	(334,000)	83,000	428,000	345,000
Property, plant and equipment						9,300,000										28,176,000	[2]													4,693,000	5,790,000	1,097,000	2,285,000	3,510,000	1,225,000
Intangible assets						7,580,000										21,188,000	[3]													0	6,110,000	6,110,000	0	1,470,000	1,470,000
Other assets						3,096,000										536,000														1,151,000	1,349,000	198,000	84,000	1,747,000	1,663,000
Total identifiable assets						51,294,000										138,744,000														34,023,000	42,152,000	8,129,000	6,034,000	9,142,000	3,108,000
Liabilities assumed [Abstract]
Accounts payable						(8,910,000)										(26,180,000)														(8,565,000)	(8,234,000)	331,000	(677,000)	(676,000)	1,000
Accrued expenses						(4,750,000)										(20,290,000)														(4,003,000)	(4,465,000)	(462,000)	(206,000)	(285,000)	(79,000)
Income taxes payable																223,000
Deferred income tax liability, noncurrent																860,000
Other long-term liabilities																(99,000)
Other current liabilities						(759,000)																								(25,000)	(759,000)	(734,000)	(214,000)	0	214,000
Noncurrent liabilities						(2,334,000)																								0	(586,000)	(586,000)	(643,000)	(1,748,000)	(1,105,000)
Total liabilities assumed						(16,753,000)										(45,486,000)														(12,593,000)	(14,044,000)	(1,451,000)	(1,740,000)	(2,709,000)	(969,000)
Net identifiable assets acquired						34,541,000										93,258,000														21,430,000	28,108,000	6,678,000	4,294,000	6,433,000	2,139,000
Goodwill	55,644,000		55,644,000		18,490,000	4,812,000										37,534,000	[4]													8,278,000	1,240,000	(7,038,000)	5,666,000	3,572,000	(2,094,000)
Net assets acquired						39,353,000										130,792,000														29,708,000	29,348,000	(360,000)	9,960,000	10,005,000	45,000
Consideration transferred [Abstract]
Cash Paid						39,353,000									130,792,000															22,400,000	29,348,000	6,948,000	9,960,000	10,005,000	45,000
Assumption of severance payment						0																								109,000	0	(109,000)	0	0	0
Fair value of consideration transferred						39,353,000									130,792,000															22,509,000	29,348,000	6,839,000	9,960,000	10,005,000	45,000
Deferred consideration						0									0															7,199,000	0	(7,199,000)	0	0	0
Total consideration paid						39,353,000																								29,708,000	29,348,000	(360,000)	9,960,000	10,005,000	45,000
Unaudited Pro forma Consolidated Results of Operations [Abstract]
Revenue																		136,984,000	161,481,000	278,451,000	305,250,000
Net earnings																		$ (3,336,000)	$ 1,382,000	$ 233,000	$ (5,977,000)
Earnings per common share - basic and diluted (in dollars per share)																						$ (0.28)	$ 0.11	$ 0.01	$ (0.51)	$ (0.29)	$ 0.12	$ 0.02	$ (0.53)

[1] The determination of fair value related to the inventory acquired was still in progress as of the date of this filing. The amount above represents only the carrying value of the inventory on Power Solutions’ balance sheet as of the acquisition date.

[2] The appraisals related to machinery and equipment acquired were incomplete as of this filing date and, as such, the amount noted above represents only the carrying value of those assets on Power Solutions’ balance sheet as of the acquisition date.

[3] The Company has identified certain intangible assets related to the Power Solutions acquisition, including trademarks and trade names, developed technology and potential in-process research and development, license agreements, non-compete agreements, an investment in a 49%-owned joint venture and customer relationships, which are being valued by a third-party appraiser. These appraisals were not complete as of the date of this filing.

[4] The amount of goodwill is provisional as of the filing date, as the fair value determination of inventory acquired, and appraisals related to property, plant and equipment, various intangible assets and certain liabilities such as lease liabilities are still underway. As the final amount of goodwill has not yet been determined or allocated by segment, the Company is unable to determine at this time the portion of goodwill, if any, that will be deductible for tax purposes