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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net income $ 14,558,000 $ 14,666,000
Adjustments to reconcile net income to cash flows provided by operating activities:    
Unrealized gain on marketable securities (2,412,000) (4,316,000)
Deferred and other income taxes (81,000) (319,000)
Unrecognized tax benefits 1,200,000 45,000
Depreciation and amortization 2,602,000 2,834,000
Provision for credit losses 0 290,000
Loss on disposal of assets 12,000 157,000
Changes in operating assets and liabilities:    
Accounts receivable 487,000 239,000
Contract assets (7,831,000) 610,000
Marketable securities (3,263,000) 9,364,000
Inventories 7,765,000 (15,712,000)
Prepaid expenses (183,000) 500,000
Accounts payable (1,268,000) (982,000)
Customer deposits (1,797,000) 951,000
Accrued expenses and other (498,000) 1,869,000
Total adjustments (5,267,000) (4,470,000)
Cash flows provided by operating activities 9,291,000 10,196,000
Cash flows used in investing activities:    
Capital expenditures (840,000) (2,746,000)
Cash flows used in investing activities (840,000) (2,746,000)
Net increase in cash and cash equivalents 8,451,000 7,450,000
Cash and cash equivalents at:    
Beginning of year 17,031,000 9,581,000
End of year 25,482,000 17,031,000
Non-cash investing and financing activities:    
Right-of-use assets obtained in exchange for operating lease liabilities $ 361,000 $ 352,000