Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash flows from operating activities:
Net income	$ 15,661,000	$ 14,558,000
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized gain on marketable securities	(1,327,000)	(2,412,000)
Deferred income taxes	(1,160,000)	(81,000)
Unrecognized tax benefits	607,000	1,200,000
Depreciation and amortization	2,356,000	2,602,000
Provision for credit losses	50,000	0
Loss on disposal of assets	0	12,000
Changes in operating assets and liabilities:
Accounts receivable	(1,200,000)	487,000
Contract assets	(2,869,000)	(7,831,000)
Marketable securities	(18,460,000)	(3,263,000)
Inventories	10,259,000	7,765,000
Prepaid expenses	953,000	(183,000)
Accounts payable	(159,000)	(1,268,000)
Customer deposits	(1,129,000)	(1,797,000)
Accrued expenses and other	(514,000)	(498,000)
Total adjustments	(12,593,000)	(5,267,000)
Net cash provided by operating activities	3,068,000	9,291,000
Cash flows from investing activities:
Capital expenditures	(1,963,000)	(840,000)
Cash used in investing activities	(1,963,000)	(840,000)
Net increase in cash and cash equivalents	1,105,000	8,451,000
Cash and cash equivalents at:
Beginning of year	25,482,000	17,031,000
End of year	26,587,000	25,482,000
Non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	$ 370,000	$ 361,000