BUSINESS SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012
Segment information
Number of segments	3
Net sales	$ 46,270	$ 50,212
Depreciation and amortization	3,002	2,911
Income (loss) from operations	(1,055)	4,138
Unallocated amounts:
Corporate expenses	(3,506)	(951)
Stock-based compensation	(1,422)	(969)
Other income	296	(200)
Interest expense	(172)	(211)
Interest income	3	6
INCOME (LOSS) BEFORE INCOME TAXES AND NON-CONTROLLING INTEREST	(928)	3,733
Explosive Metalworking
Segment information
Net sales	26,180	27,533
Depreciation and amortization	1,456	1,402
Income (loss) from operations	2,444	4,099
Oilfield Products
Segment information
Net sales	18,655	20,974
Depreciation and amortization	1,396	1,385
Income (loss) from operations	1,723	2,046
AMK Welding
Segment information
Net sales	1,435	1,705
Depreciation and amortization	150	124
Income (loss) from operations	(294)	(87)
Total reportable segments
Segment information
Income (loss) from operations	$ 3,873	$ 6,058
Total Net Sales [Member] | Customer Concentration Risk [Member]
Unallocated amounts:
Number of customers representing greater than 10% of total net sales	0	0