Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net income (loss)	$ 5,108	$ (3,922)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	6,518	6,562
Amortization	174	232
Stock-based compensation	3,118	1,567
Bad debt expense	339	469
Deferred income tax expense (benefit)	337	7,549
Gain on amended supply agreement	(1,015)	(1,015)
Cash received from amended supply agreement		2,333
Changes in operating assets and liabilities:
Accounts receivable, net	(1,574)	(18,321)
Costs and billings in excess of estimated earnings on uncompleted contracts	11,810	13,050
Inventories	2,653	(3,360)
Prepaid expenses and other current assets	2,133	1,613
Accounts payable and income taxes payable	(4,756)	(3,564)
Accrued liabilities	106	(6,845)
Other, net	257	(450)
Net cash provided by (used in) operating activities	25,208	(4,102)
Investing Activities:
Proceeds from sale of property, plant and equipment	39	43
Purchases of property, plant and equipment	(1,126)	(28,692)
Net cash used in investing activities	(1,087)	(28,649)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)
Shares withheld in lieu of employee tax withholding	(808)	(557)
Purchase of treasury shares	(3,740)	(5,759)
Dividends paid	(5,921)	(6,264)
Net cash used in financing activities	(10,869)	(12,980)
Net increase (decrease) in cash and cash equivalents	13,252	(45,731)
Effect of exchange rate changes on cash and cash equivalents	537	(1,715)
Cash and cash equivalents, beginning of period	43,569	103,118
Cash and cash equivalents, end of period	$ 57,358	$ 55,672