SEGMENT INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015
Financial results of reportable segments
Sales		$ 67,211		$ 76,805		$ 205,218		$ 228,289
Depreciation and amortization						6,095		6,831
Segment (loss) income		(640)		756		(1,583)		1,722
Capital expenditures						1,543		3,103
Segment assets		302,849				302,849				$ 311,135
Reconciliation of segment income to consolidated income before income taxes
(Loss) income before income taxes		(726)		635		(1,818)		1,330
Operating segment
Financial results of reportable segments
Sales		67,211		76,805		205,218		228,289
Depreciation and amortization		1,931		2,196		5,915		6,619
Segment (loss) income		863		1,978		3,478		5,866
Capital expenditures		551		1,110		1,543		3,103
Segment assets		274,959	[1]	289,160	[1]	274,959	[1]	289,160	[1]	274,334
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense		(1,503)		(1,222)		(5,061)		(4,144)
Interest expense, net		86		121		235		392
(Loss) income before income taxes		(726)		635		(1,818)		1,330
Operating segment | MMS
Financial results of reportable segments
Sales		52,089		60,856		158,718		180,042
Depreciation and amortization		1,433		1,643		4,353		4,881
Segment (loss) income		(984)		895		(1,864)		1,729
Capital expenditures		433		983		1,119		2,229
Segment assets	[1]	226,618		239,594		226,618		239,594
Operating segment | ATA
Financial results of reportable segments
Sales		15,270		16,005		46,773		48,904
Depreciation and amortization		498		553		1,562		1,738
Segment (loss) income		1,847		1,083		5,342		4,137
Capital expenditures		118		127		424		874
Segment assets	[1]	48,341		49,566		48,341		49,566
Inter-Segment Eliminations
Financial results of reportable segments
Sales		(148)		$ (56)		(273)		$ (657)
Unallocated assets
Financial results of reportable segments
Segment assets		27,890				27,890				36,801
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 22,900				$ 22,900				$ 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.