SEGMENT INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016
Financial results of reportable segments
Sales		$ 64,557		$ 67,822
Depreciation and amortization		2,157		2,017
Segment (loss) income		(1,785)		(1,245)
Capital expenditures		480		436
Segment assets		299,796				$ 297,550
Reconciliation of segment income to consolidated income before income taxes
Loss before income taxes		(1,850)		(1,331)
Operating segment
Financial results of reportable segments
Sales		64,557		67,822
Depreciation and amortization		1,908		1,965
Segment (loss) income		(384)		698
Capital expenditures		480		436
Segment assets		268,861	[1]	275,719	[1]	265,279
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense		(1,401)		(1,943)
Interest expense, net		65		86
Other unallocated income (expense)		0		0
Loss before income taxes		(1,850)		(1,331)
Operating segment | MMS
Financial results of reportable segments
Sales		48,833		52,272
Depreciation and amortization		1,400		1,427
Segment (loss) income		(2,669)		(1,156)
Capital expenditures		336		291
Segment assets	[1]	223,349		225,987
Operating segment | ATA
Financial results of reportable segments
Sales		15,858		15,620
Depreciation and amortization		508		538
Segment (loss) income		2,285		1,854
Capital expenditures		144		145
Segment assets	[1]	45,512		49,732
Inter-Segment Eliminations
Financial results of reportable segments
Sales		(134)		$ (70)
Unallocated assets
Financial results of reportable segments
Segment assets		30,935				32,271
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 26,700				$ 28,300

[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.