SEGMENT INFORMATION (Details)		3 Months Ended								12 Months Ended
		Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) reportable_segment Rate	Dec. 31, 2014 USD ($) reportable_segment	Dec. 31, 2013 USD ($) reportable_segment
Industry segment and foreign operations
Number of reportable business segments | reportable_segment										2	2	1
Number of primary product groups										2
Financial results of reportable segments
Sales		$ 86,960,000	$ 76,805,000	$ 82,356,000	$ 69,128,000	$ 93,008,000	$ 68,924,000	$ 78,851,000	$ 70,850,000	$ 315,249,000	$ 311,633,000	$ 329,459,000
Depreciation and amortization										8,509,000	9,847,000	9,560,000
Segment (loss) income										4,937,000	(447,000)	6,996,000
Capital expenditures										4,210,000	3,186,000	3,871,000
Segment assets		311,300,000				311,320,000				311,300,000	311,320,000	344,183,000
Reconciliation of segment income to consolidated income before income taxes
Goodwill and Intangible Asset Impairment										0	(5,766,000)	(6,239,000)
Income (loss) from continuing operations before income taxes										$ 4,438,000	(1,125,000)	5,932,000
Maximum amount of sales attributable to a single customer | Rate										6.00%
Operating segment
Financial results of reportable segments
Sales										$ 315,249,000	311,633,000	329,459,000
Depreciation and amortization										8,782,000	9,497,000	8,882,000
Segment (loss) income										10,737,000	10,658,000	22,027,000
Capital expenditures										4,195,000	3,186,000	3,871,000
Segment assets	[1]	274,334,000				290,300,000				274,334,000	290,300,000	299,255,000
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense										(5,800,000)	(5,540,000)	(4,563,000)
Acquisition related inventory step-up charge										0	86,000	1,927,000
Business Combination, Acquisition Related Costs										0	(178,000)	(2,154,000)
Goodwill and Intangible Asset Impairment										0	(5,766,000)	(6,239,000)
Interest expense, net										499,000	678,000	1,064,000
Other unallocated income (expense)										0	465,000	(148,000)
Income (loss) from continuing operations before income taxes										4,438,000	(1,125,000)	5,932,000
Operating segment | MMS
Financial results of reportable segments
Sales										250,854,000	243,199,000	278,377,000
Depreciation and amortization										6,497,000	6,952,000	6,897,000
Segment (loss) income										7,365,000	3,950,000	16,338,000
Capital expenditures										3,186,000	2,088,000	2,603,000
Segment assets	[1]	226,265,000				238,462,000				226,265,000	238,462,000	253,173,000
Operating segment | ATA
Financial results of reportable segments
Sales										65,128,000	68,788,000	51,553,000
Depreciation and amortization										2,285,000	2,545,000	1,985,000
Segment (loss) income										3,372,000	6,708,000	5,689,000
Capital expenditures										1,009,000	1,098,000	1,268,000
Segment assets	[1]	48,069,000				51,838,000				48,069,000	51,838,000	46,082,000
Inter-Segment Eliminations
Financial results of reportable segments
Sales										(733,000)	(354,000)	(471,000)
Unallocated assets
Financial results of reportable segments
Segment assets		36,966,000				21,020,000				36,966,000	21,020,000	44,928,000
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 32,800,000				$ 16,300,000				32,800,000	$ 16,300,000	$ 34,722,000
Minimum | MMS
Reconciliation of segment income to consolidated income before income taxes
Average selling price										40,000
Minimum | ATA
Reconciliation of segment income to consolidated income before income taxes
Average selling price										50
Maximum | MMS
Reconciliation of segment income to consolidated income before income taxes
Average selling price										2,000,000
Maximum | ATA
Reconciliation of segment income to consolidated income before income taxes
Average selling price										$ 50,000

[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.