Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net loss	$ (4,063)	$ (589)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,831	5,289
Stock-based compensation	1,720	1,747
Bad debt expense (recovery), net	445	(132)
Deferred income taxes	(51)	(1,022)
Changes in operating assets and liabilities:
Accounts receivable, net	(12,662)	(820)
Contract assets and liabilities, net	9,888	(16,647)
Inventories	(13,835)	(707)
Income taxes	31	(1,231)
Prepaid expenses and other current assets	1,009	2,542
Accounts payable	3,372	3,908
Accrued liabilities	(5,761)	(9,119)
Other, net	2,068	(1,298)
Net cash used in operating activities	(13,008)	(18,079)
Investing Activities:
Purchases of short-term investments	(15,090)	(15,835)
Maturities of short-term investments	7,995	15,788
Purchases of property, plant and equipment	(1,116)	(1,623)
Proceeds from sale of property, plant and equipment	587	33
Proceeds from life insurance policies	0	474
Net cash used in investing activities	(7,624)	(1,163)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)
Shares withheld in lieu of employee tax withholding	(660)	(632)
Dividends paid	(6,106)	(6,063)
Net cash used in financing activities	(7,166)	(7,095)
Net decrease in cash and cash equivalents	(27,798)	(26,337)
Effect of exchange rate changes on cash and cash equivalents	(85)	214
Cash and cash equivalents at beginning of period	114,314	160,216
Cash and cash equivalents at end of period	$ 86,431	$ 134,093