SEGMENT INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014		Dec. 31, 2014
Financial results of reportable segments
Sales		$ 76,805		$ 68,924		$ 228,289		$ 218,625
Depreciation and amortization						6,831		7,317
Segment income (loss)		756		(6,878)		1,722		(5,533)
Capital expenditures						3,103		1,830
Segment assets		312,075				312,075				$ 311,320
Reconciliation of segment income to consolidated income before income taxes
Income (loss) from continuing operations before income taxes		635		(7,034)		1,330		(6,055)
Operating segment
Financial results of reportable segments
Sales		76,805		68,924		228,289		218,625
Depreciation and amortization		2,196		2,350		6,619		7,171
Segment income (loss)		1,978		(377)		5,866		4,051
Capital expenditures		1,110		706		3,103		1,830
Segment assets		289,160	[1]	300,446	[1]	289,160	[1]	300,446	[1]	290,816
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense		(1,224)		(1,181)		(3,995)		(4,180)
Interest expense, net		121		156		392		522
Other unallocated expense		2		(5,320)		(149)		(5,404)
Income (loss) from continuing operations before income taxes		635		(7,034)		1,330		(6,055)
Operating segment | MMS
Financial results of reportable segments
Sales		60,856		52,353		180,042		167,977
Depreciation and amortization		1,643		1,721		4,881		5,255
Segment income (loss)		895		(1,715)		1,729		(1,021)
Capital expenditures		983		457		2,229		1,136
Segment assets	[1]	239,594		248,789		239,594		248,789
Operating segment | ATA
Financial results of reportable segments
Sales		16,005		16,681		48,904		50,909
Depreciation and amortization		553		629		1,738		1,916
Segment income (loss)		1,083		1,338		4,137		5,072
Capital expenditures		127		249		874		694
Segment assets	[1]	49,566		51,657		49,566		51,657
Inter-Segment Eliminations
Financial results of reportable segments
Sales		(56)		$ (110)		(657)		$ (261)
Unallocated assets
Financial results of reportable segments
Segment assets		22,915				22,915				20,504
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 18,500				$ 18,500				$ 16,300

[1] Segment assets primarily consist of restricted cash, accounts receivable, inventories, prepaid and other assets, property, plant and equipment, and intangible assets. Unallocated assets primarily include, cash and cash equivalents, corporate property, plant and equipment, deferred income taxes, and other non-current assets.