Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities:
Net income	$ 5,666	$ 4,165
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,020	5,037
Amortization	1,413	2,456
Stock-based compensation	386	1,088
Bad debt expense	636	606
Deferred income taxes	304	(782)
Gain on sale of investment		(1,229)
Changes in operating assets and liabilities:
Accounts receivable	11,755	(10,324)
Costs and estimated earnings in excess of billings on uncompleted contracts	(25,911)	2,172
Inventories	(5,964)	(739)
Prepaid expenses and other current assets	6,391	3,176
Accounts payable and income taxes payable	4,632	656
Accrued liabilities	(4,925)	(12,927)
Billings in excess of costs and estimated earnings on uncompleted contracts	24,015	15,884
Other	(41)	(749)
Net cash provided by operating activities	23,377	8,490
Investing Activities:
Proceeds from sale of fixed assets	70	60
Purchases of property, plant and equipment	(18,879)	(2,667)
Increase in cash held in escrow	(75)
Decrease in cash held in escrow	1,000
Proceeds from sale of investment in joint venture		1,229
Net cash used in investing activities	(17,884)	(1,378)
Financing Activities:
Borrowings on Canadian revolving line of credit	7,352	2,619
Payments on Canadian revolving line of credit	(7,352)	(2,627)
Payments on industrial development revenue bonds	(400)	(400)
Short-term and other financing	19	(189)
Net cash used in financing activities	(381)	(597)
Net increase in cash and cash equivalents	5,112	6,515
Effect of exchange rate changes on cash and cash equivalents	(513)	188
Cash and cash equivalents at beginning of period	123,466	115,353
Cash and cash equivalents at end of period	$ 128,065	$ 122,056