CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Operating Activities:
Net income (loss)	$ 9,890	$ (7,152)	$ (9,486)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	12,032	12,903	12,755
Stock-based compensation	3,839	3,152	2,724
Bad debt expense (recovery)	233	111	(160)
Deferred income taxes	820	(2,170)	100
Gain on amended supply agreement	0	(507)	(2,029)
Gain on cash surrender value of life insurance	0	(240)	0
Cash received from amended supply agreement	0	0	2,333
Changes in operating assets and liabilities:
Accounts receivable, net	(20,193)	(37,176)	47,983
Contract assets and liabilities, net	55,333	(14,117)	(3,270)
Inventories	(7,989)	(3,023)	8,213
Income taxes	6,681	996	(6,758)
Prepaid expenses and other current assets	(2,626)	(237)	453
Accounts payable	9,550	8,152	(2,417)
Accrued liabilities	1,419	8,859	(11,676)
Other, net	(230)	1,906	(1,950)
Net cash provided by (used in) operating activities	68,759	(28,543)	36,815
Investing Activities:
Purchases of short-term investments	(5,869)	(22,261)	(60,018)
Maturities of short-term investments	13,088	35,248	33,189
Purchases of property, plant and equipment, net	(4,255)	(4,415)	(3,624)
Proceeds from life insurance policy	0	1,861	0
Net cash provided by (used in) investing activities	2,964	10,433	(30,453)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)	(400)
Shares withheld in lieu of employee tax withholding	(1,454)	(712)	(398)
Dividends paid	(11,998)	(11,916)	(11,875)
Net cash used in financing activities	(13,852)	(13,028)	(12,673)
Net increase (decrease) in cash, cash equivalents and restricted cash	57,871	(31,138)	(6,311)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(957)	(347)	1,801
Cash, cash equivalents and restricted cash at beginning of period	61,725	93,210	97,720
Cash, cash equivalents and restricted cash at end of period	$ 118,639	$ 61,725	$ 93,210

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