Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating Activities:
Net loss	$ (459)	$ (239)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	3,196	3,318
Amortization	88	118
Stock-based compensation	2,343	1,116
Bad debt expense	248	283
Deferred income tax expense (benefit)	48	(317)
Gain on amended supply agreement	(507)	(507)
Changes in operating assets and liabilities:
Accounts receivable, net	18,603	(25,674)
Costs and billings in excess of estimated earnings on uncompleted contracts	6,921	20,943
Inventories	(1,478)	(3,998)
Prepaid expenses and other current assets	(1,522)	467
Accounts payable and income taxes payable	(1,874)	(5,462)
Accrued liabilities	(1,898)	(12,793)
Other, net	356	17
Net cash provided by (used in) operating activities	24,065	(22,728)
Investing Activities:
Proceeds from sale of property, plant and equipment	12	31
Purchases of property, plant and equipment	(629)	(18,962)
Net cash used in investing activities	(617)	(18,931)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)
Shares withheld in lieu of employee tax withholding	(795)	(454)
Purchase of treasury shares	(3,740)
Dividends paid	(2,992)	(3,128)
Net cash used in financing activities	(7,927)	(3,982)
Net increase (decrease) in cash and cash equivalents	15,521	(45,641)
Effect of exchange rate changes on cash and cash equivalents	(166)	(1,013)
Cash and cash equivalents, beginning of period	43,569	103,118
Cash and cash equivalents, end of period	$ 58,924	$ 56,464