Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income (loss)	$ (372,000)	$ 5,805,000
Adjustments to reconcile net income (loss) to cash (used in) provided by operating activities:
Purchase of marketable securities	(135,551,000)	(136,651,000)
Proceeds from sale and maturity of marketable securities	133,966,000	134,866,000
Change in value of marketable securities	7,261,000	(3,693,000)
Deferred and other income taxes	(3,287,000)	(451,000)
Depreciation and amortization	2,823,000	2,591,000
Provision for doubtful accounts	194,000	50,000
Changes in assets and liabilities, excluding the initial effects of business combinations:
Accounts receivable	(568,000)	(680,000)
Costs and estimated earnings in excess of billings	(215,000)	4,502,000
Inventories	(13,927,000)	(4,413,000)
Prepaid expenses	(467,000)	(1,013,000)
Accounts payable	1,146,000	1,377,000
Customer deposits	620,000	1,391,000
Accrued expenses and other	(758,000)	139,000
Total adjustments	(8,763,000)	(1,985,000)
Cash flows (used in) provided by operating activities	(9,135,000)	3,820,000
Cash flows used in investing activities:
Acquisition of Blaw-Knox assets		(13,777,000)
Capital expenditures	(4,516,000)	(2,659,000)
Cash flows used in investing activities	(4,516,000)	(16,436,000)
Cash flows from financing activities:
Proceeds from stock option exercises		264,000
Cash flows provided by financing activities		264,000
Net increase in cash and cash equivalents	(13,651,000)	(12,352,000)
Cash and cash equivalents at:
Beginning of year	23,232,000	35,584,000
End of year	$ 9,581,000	23,232,000
Non-cash investing and financing activities:
Operating lease right-of-use assets		248,000
Operating lease liabilities		$ 248,000