SEGMENT INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014
Financial results of reportable segments
Sales		$ 82,356		$ 78,851		$ 151,484		$ 149,701
Depreciation and amortization						4,567		5,049
Segment income		2,383		1,636		966		1,345
Capital expenditures						1,993		1,124
Segment assets		323,976				323,976				$ 311,320
Reconciliation of segment income to consolidated income before income taxes
Income from continuing operations before income taxes		2,252		1,493		695		979
Operating segment
Financial results of reportable segments
Sales		82,356		78,851		151,484		149,701
Depreciation and amortization		2,199		2,405		4,423		4,821
Segment income		3,600		3,262		3,888		4,428
Capital expenditures		1,294		799		1,993		1,124
Segment assets		297,119	[1]	290,816	[1]	297,119	[1]	290,816	[1]	290,816
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense		(1,068)		(1,542)		(2,771)		(2,999)
Interest expense, net		131		143		271		366
Other unallocated expense		(149)		(84)		(151)		(84)
Income from continuing operations before income taxes		2,252		1,493		695		979
Operating segment | MMS
Financial results of reportable segments
Sales		66,210		61,435		119,186		115,624
Depreciation and amortization		1,614		1,757		3,238		3,534
Segment income		1,743		1,336		834		694
Capital expenditures		940		421		1,246		679
Segment assets	[1]	246,331		241,340		246,331		241,340
Operating segment | ATA
Financial results of reportable segments
Sales		16,672		17,495		32,899		34,228
Depreciation and amortization		585		648		1,185		1,287
Segment income		1,857		1,926		3,054		3,734
Capital expenditures		354		378		747		445
Segment assets	[1]	50,788		49,476		50,788		49,476
Inter-Segment Eliminations
Financial results of reportable segments
Sales		(526)		$ (79)		(601)		$ (151)
Unallocated assets
Financial results of reportable segments
Segment assets		26,857				26,857				20,504
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 22,800				$ 22,800				$ 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.