Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ 14,666,000	$ (372,000)
Adjustments to reconcile net income (loss) to cash flows provided by (used in) operating activities:
Purchase of marketable securities	(172,341,000)	(135,551,000)
Proceeds from sale and maturity of marketable securities	180,285,000	133,966,000
Change in value of marketable securities	(2,896,000)	7,261,000
Deferred and other income taxes	(274,000)	(3,287,000)
Depreciation and amortization	2,834,000	2,823,000
Provision for doubtful accounts	290,000	194,000
Loss on disposal of assets	157,000
Changes in assets and liabilities, excluding the initial effects of business combinations:
Accounts receivable	239,000	(568,000)
Costs and estimated earnings in excess of billings	610,000	(215,000)
Inventories	(15,712,000)	(13,927,000)
Prepaid expenses	500,000	(467,000)
Accounts payable	(982,000)	1,146,000
Customer deposits	951,000	620,000
Accrued expenses and other	1,869,000	(758,000)
Total adjustments	(4,470,000)	(8,763,000)
Cash flows provided by (used in) operating activities	10,196,000	(9,135,000)
Cash flows used in investing activities:
Capital expenditures	(2,746,000)	(4,516,000)
Cash flows used in investing activities	(2,746,000)	(4,516,000)
Net increase (decrease) in cash and cash equivalents	7,450,000	(13,651,000)
Cash and cash equivalents at:
Beginning of year	9,581,000	23,232,000
End of year	17,031,000	$ 9,581,000
Non-cash investing and financing activities:
Operating lease right-of-use assets	352,000
Operating lease liabilities	$ 352,000