CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net income (loss)	$ (7,152)	$ (9,486)	$ 15,510
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	12,698	12,400	12,979
Amortization	205	355	352
Stock-based compensation	3,152	2,724	4,883
Excess tax benefit from stock-based compensation	0	0	387
Bad debt expense/(recovery)	111	(160)	187
Deferred income taxes	(2,170)	100	2,330
Gain on amended supply agreement	(507)	(2,029)	(2,029)
Gain on cash surrender value of life insurance	(240)	0	0
Cash received from amended supply agreement	0	2,333	2,333
Changes in operating assets and liabilities:
Accounts receivable	(37,176)	47,983	369
Costs and billings in excess of estimates on uncompleted contracts	(14,117)	(3,270)	39,612
Inventories	(3,023)	8,213	6,159
Income taxes	996	(6,758)	(195)
Prepaid expenses and other current assets	(237)	453	861
Accounts payable	8,152	(2,417)	(11,658)
Accrued liabilities	8,859	(11,676)	3,927
Other, net	1,906	(1,950)	(1,101)
Net cash provided by (used in) operating activities	(28,543)	36,815	74,906
Investing Activities:
Purchases of property, plant and equipment	(4,502)	(3,636)	(3,044)
Proceeds from sale of property, plant and equipment	87	12	187
Purchases of short-term investments	(22,261)	(60,018)	0
Maturities of short-term investments	35,248	33,189	0
Proceeds from life insurance policy	1,861	0	0
Changes in restricted cash	(290)	(24,851)	0
Net cash provided by (used in) investing activities	10,143	(55,304)	(2,857)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)	(400)
Excess tax benefit from stock-based compensation	0	0	(387)
Shares withheld in lieu of employee tax withholding	(712)	(398)	(1,000)
Purchase of treasury shares	0	0	(3,740)
Dividends paid	(11,916)	(11,875)	(11,845)
Net cash used in financing activities	(13,028)	(12,673)	(17,372)
Net increase (decrease) in cash and cash equivalents	(31,428)	(31,162)	54,677
Effect of exchange rate changes on cash and cash equivalents	(347)	1,801	(526)
Cash and cash equivalents, beginning of period	68,359	97,720	43,569
Cash and cash equivalents, end of period	$ 36,584	$ 68,359	$ 97,720

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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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