SEGMENT INFORMATION (Details)		3 Months Ended								12 Months Ended
		Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) reportable_segment product Rate	Dec. 31, 2015 USD ($) reportable_segment	Dec. 31, 2014 USD ($)
Industry segment and foreign operations
Number of reportable business segments | reportable_segment										2	2
Number of primary product groups | product										2
Financial results of reportable segments
Sales		$ 86,794,000	$ 67,211,000	$ 70,186,000	$ 67,822,000	$ 86,960,000	$ 76,805,000	$ 82,356,000	$ 69,128,000	$ 292,013,000	$ 315,249,000	$ 311,633,000
Depreciation and amortization										8,789,000	8,824,000	10,169,000
Segment (loss) income										3,395,000	4,937,000	(447,000)
Capital expenditures										2,479,000	4,210,000	3,186,000
Segment assets		297,550,000				310,938,000				297,550,000	310,938,000	311,084,000
Reconciliation of segment income to consolidated income before income taxes
Goodwill and Intangible Asset Impairment										0	0	(5,766,000)
Income (loss) from continuing operations before income taxes										$ 3,067,000	4,438,000	(1,125,000)
Maximum amount of sales attributable to a single customer | Rate										5.00%
Operating segment
Financial results of reportable segments
Sales										$ 292,013,000	315,249,000	311,633,000
Depreciation and amortization										7,819,000	8,782,000	9,497,000
Segment (loss) income										9,970,000	10,737,000	10,658,000
Capital expenditures										2,479,000	4,195,000	3,186,000
Segment assets	[1]	265,279,000				274,334,000				265,279,000	274,334,000	290,816,000
Reconciliation of segment income to consolidated income before income taxes
Unallocated corporate expense										(6,575,000)	(5,800,000)	(5,540,000)
Acquisition related inventory step-up charge										0	0	(86,000)
Business Combination, Acquisition Related Costs										0	0	(178,000)
Goodwill and Intangible Asset Impairment										0	0	(5,766,000)
Interest expense, net										(328,000)	(499,000)	(678,000)
Other unallocated income (expense)										0	0	465,000
Income (loss) from continuing operations before income taxes										3,067,000	4,438,000	(1,125,000)
Operating segment | MMS
Financial results of reportable segments
Sales										230,705,000	250,854,000	243,199,000
Depreciation and amortization										5,764,000	6,497,000	6,952,000
Segment (loss) income										3,060,000	7,365,000	3,950,000
Capital expenditures										1,943,000	3,186,000	2,088,000
Segment assets	[1]	219,503,000				226,265,000				219,503,000	226,265,000	241,340,000
Operating segment | ATA
Financial results of reportable segments
Sales										61,647,000	65,128,000	68,788,000
Depreciation and amortization										2,055,000	2,285,000	2,545,000
Segment (loss) income										6,910,000	3,372,000	6,708,000
Capital expenditures										536,000	1,009,000	1,098,000
Segment assets	[1]	45,776,000				48,069,000				45,776,000	48,069,000	49,476,000
Inter-Segment Eliminations
Financial results of reportable segments
Sales										(339,000)	(733,000)	(354,000)
Unallocated assets
Financial results of reportable segments
Segment assets		32,271,000				36,604,000				32,271,000	36,604,000	20,268,000
Reconciliation of segment income to consolidated income before income taxes
Cash		$ 28,300,000				$ 32,800,000				28,300,000	$ 32,800,000	$ 16,300,000
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										40
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										$ 200,000

[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.