SEGMENT INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015		Dec. 31, 2015
Financial results of reportable segments
Sales		$ 67,822		$ 69,128
Depreciation and amortization		2,017		2,338
Segment (loss) income		(1,245)		(1,417)
Capital expenditures		436		699
Segment assets		309,510				$ 311,135
Reconciliation of segment income to consolidated income before income taxes
Loss before income taxes		(1,331)		(1,557)
Operating segment
Financial results of reportable segments
Sales		67,822		69,128
Depreciation and amortization		1,965		2,224
Segment (loss) income		698		288
Capital expenditures		436		699
Segment assets		275,719	[1]	290,374	[1]	274,334
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense		(1,943)		(1,704)
Interest expense, net		86		140
Other unallocated income (expense)		0		(1)
Loss before income taxes		(1,331)		(1,557)
Operating segment | MMS
Financial results of reportable segments
Sales		52,272		52,976
Depreciation and amortization		1,427		1,624
Segment (loss) income		(1,156)		(909)
Capital expenditures		291		306
Segment assets	[1]	225,987		236,762
Operating segment | ATA
Financial results of reportable segments
Sales		15,620		16,227
Depreciation and amortization		538		600
Segment (loss) income		1,854		1,197
Capital expenditures		145		393
Segment assets	[1]	49,732		53,612
Inter-Segment Eliminations
Financial results of reportable segments
Sales		(70)		$ (75)
Unallocated assets
Financial results of reportable segments
Segment assets		33,791				36,801
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 29,300				$ 32,800

[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.