CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 11,694	$ 12,441	$ 5,255
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation (including capital lease amortization)	5,537	5,492	5,383
Amortization of purchased intangible assets	6,210	5,707	5,330
Amortization of deferred debt issuance costs	124	649	587
Stock-based compensation	4,443	3,397	3,501
Deferred income tax benefit	(1,267)	(1,587)	(1,708)
Equity in earnings of joint ventures			(255)
Gain on step acquisition of joint ventures			(2,117)
Loss on disposal of property, plant and equipment		35	34
Change in:
Accounts receivable, net	560	(9,551)	2,690
Inventories	(2,342)	(8,392)	1,696
Prepaid expenses and other	(149)	(1,346)	(437)
Accounts payable	(3,618)	(1,035)	2,970
Customer advances	(578)	465	(4,871)
Accrued expenses and other liabilities	(644)	3,451	(1,365)
Net cash provided by operating activities	19,970	9,726	16,693
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(15,647)	(7,726)	(3,527)
Acquisition of TRX Industries	(10,294)
Acquisition of Austin Explosives Company			(3,620)
Step acquisition of joint ventures, net of cash acquired			(2,065)
Change in other non-current assets	386	(5)	(53)
Net cash used in investing activities	(25,555)	(7,731)	(9,265)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment on syndicated term loans		(22,247)	(22,124)
Borrowings on bank lines of credit, net	12,174	24,191	780
Payment on loans with former owners of LRI	(1,176)	(36)
Payment on Nord LB term loans		(627)	(797)
Payment on capital lease obligations	(66)	(295)	(304)
Payment of dividends	(2,155)	(2,130)	(2,089)
Payment of deferred debt issuance costs		(435)
Contribution from non-controlling stockholder		42
Net proceeds from issuance of common stock to employees and directors	193	177	188
Tax impact of stock-based compensation	(453)	(35)	(601)
Net cash provided by (used in) financing activities	8,517	(1,395)	(24,947)
EFFECTS OF EXCHANGE RATES ON CASH	(8)	104	(320)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,924	704	(17,839)
CASH AND CASH EQUIVALENTS, beginning of the period	5,276	4,572	22,411
CASH AND CASH EQUIVALENTS, end of the period	8,200	5,276	4,572
Cash paid during the period for -
Interest	746	1,280	2,458
Income taxes, net	7,395	5,847	4,111
NON-CASH FINANCING ACTIVITY:
Common stock issued for acquisitions			$ 3,301