DISCONTINUED OPERATIONS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended			0 Months Ended	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 01, 2014	Dec. 31, 2014
Discontinued Operations, Disposal [Abstract]
Cash consideration												$ 6,830	$ 0	$ 0
Gain on sale of discontinued operations, net of tax				0								718	0	0
Discontinued Operations, Income Statement Disclosures [Abstract]
Income (loss) from operations, net of tax	20	219	(316)	6	255	310	(93)	(97)	217	(77)	473	(77)	478	943
Gain on sale of discontinued operations, net of tax				0								718	0	0
AMK Technical Services [Member]
Discontinued Operations, Disposal [Abstract]
Net proceeds															6,830
Cash consideration															4,330
Secured promissory note receivable															2,500
Secured promissory note receivable, term															90 days
Gain on sale of discontinued operations, net of tax												718	0	0		1,476
Discontinued Operations, Income Statement Disclosures [Abstract]
Net sales												4,540	7,513	8,830
Income (loss) from operations												(76)	719	1,404
Tax provision												1	241	461
Income (loss) from operations, net of tax												(77)	478	943
Gain on sale of discontinued operations												1,476	0	0
Tax provision												758	0	0
Gain on sale of discontinued operations, net of tax												718	0	0		1,476
Discontinued Operations, Balance Sheet Disclosures [Abstract]
Cash				19									19
Accounts receivable				930									930
Inventory				359									359
Prepaid expenses and other				6									6
Current deferred tax assets				67									67
Property, plant and equipment, net				4,801									4,801
Noncurrent deferred tax assets				117									117
Total assets				6,299									6,299
Accounts payable				101									101
Accrued expenses				63									63
Accrued employee compensation				254									254
Customer advances				6									6
Noncurrent deferred tax liabilities				402									402
Total liabilities				$ 826									$ 826