CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Operating Activities:
Net income	$ 13,737	$ 631	$ 16,660
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	9,358	10,335	10,538
Gain on sale of division	(2,006)	0	0
Stock-based compensation	4,090	2,583	3,474
Bad debt expense, net	162	48	258
Deferred income taxes	(4,861)	(995)	1,473
Gain on cash surrender value of life insurance	0	0	(506)
Changes in operating assets and liabilities:
Accounts receivable, net	(31,629)	(7,509)	41,969
Contract assets and liabilities, net	3,122	(39,951)	12,546
Inventories	(21,426)	(599)	304
Income taxes	688	(473)	720
Prepaid expenses and other current assets	(2,577)	412	662
Accounts payable	18,594	9,760	(15,309)
Accrued liabilities	8,908	(3,151)	465
Other, net	258	(1,552)	(860)
Net cash provided by (used in) operating activities	(3,582)	(30,461)	72,394
Investing Activities:
Purchases of short-term investments	(22,381)	(27,735)	(18,553)
Maturities of short-term investments	26,320	27,688	6,146
Proceeds from sale of division	4,348	0	0
Purchases of property, plant and equipment	(2,451)	(2,931)	(5,163)
Proceeds from sale of property, plant and equipment	629	40	33
Proceeds from life insurance policy	0	474	0
Net cash provided by (used in) investing activities	6,465	(2,464)	(17,537)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)	(400)
Shares withheld in lieu of employee tax withholding	(675)	(632)	(629)
Dividends paid	(12,233)	(12,142)	(12,066)
Net cash used in financing activities	(13,308)	(13,174)	(13,095)
Net increase (decrease) in cash, cash equivalents and restricted cash	(10,425)	(46,099)	41,762
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,935)	197	(185)
Cash, cash equivalents and restricted cash at beginning of period	114,314	160,216	118,639
Cash, cash equivalents and restricted cash at end of period	$ 101,954	$ 114,314	$ 160,216