CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Operating Activities:
Net income	$ 15,510	$ 9,439	$ 29,224
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,979	13,120	11,386
Amortization	352	435	779
Gain on sale of discontinued operations, net of tax			(8,563)
Stock-based compensation	4,883	3,171	3,385
Excess tax benefit from stock-based compensation	387	191	(407)
Bad debt expense/(recovery)	187	(29)	1,074
Deferred income tax expense (benefit)	2,330	10,521	(3,212)
Gain on amended supply agreement	(2,029)	(2,029)	(1,522)
Cash received from amended supply agreement	2,333	2,333	10,000
Changes in operating assets and liabilities:
Accounts receivable, net	369	391	1,959
Costs and billings in excess of estimates on uncompleted contracts	39,612	(17,430)	(17,089)
Inventories	6,159	(572)	(3,959)
Prepaid expenses and other current assets	1,342	2,656	(1,101)
Accounts payable and income taxes payable	(12,334)	(5,073)	1,002
Accrued liabilities	3,927	(3,373)	(4,997)
Other, net	(1,101)	(833)	1,524
Net assets held for sale			(10,355)
Net cash provided by operating activities	74,906	12,918	9,128
Investing Activities:
Proceeds from sale of property, plant and equipment	187	112	118
Proceeds from sale of Transdyn			14,819
Purchases of property, plant and equipment	(3,044)	(34,719)	(16,495)
Net cash used in investing activities	(2,857)	(34,607)	(1,558)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)	(400)
Excess tax benefit from stock-based compensation	(387)	(191)	407
Shares withheld in lieu of employee tax withholding	(1,000)	(740)	(499)
Purchase of treasury shares	(3,740)	(21,259)
Dividends paid	(11,845)	(12,358)	(11,998)
Payments on short-term and other financing			(16)
Net cash used in financing activities	(17,372)	(34,948)	(12,506)
Net increase (decrease) in cash and cash equivalents	54,677	(56,637)	(4,936)
Effect of exchange rate changes on cash and cash equivalents	(526)	(2,912)	643
Cash and cash equivalents, beginning of period	43,569	103,118	107,411
Cash and cash equivalents, end of period	$ 97,720	$ 43,569	$ 103,118