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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 11,561,000 $ (850,000)
Adjustments to reconcile net income (loss) to cash used in operating activities:    
Purchase of marketable securities (118,867,000) (101,913,000)
Proceeds from sale and maturity of marketable securities 122,282,000 100,705,000
Change in value of marketable securities (2,528,000) 5,068,000
Deferred and other income taxes 1,021,000 (1,177,000)
Depreciation and amortization 2,091,000 2,063,000
Provision for doubtful accounts 290,000 140,000
Loss on disposal of assets 157,000 0
Changes in assets and liabilities:    
Accounts receivable (771,000) (1,716,000)
Costs and estimated earnings in excess of billings (4,795,000) 537,000
Inventories (10,976,000) (6,356,000)
Prepaid expenses and other current assets (326,000) (1,518,000)
Accounts payable (851,000) 1,896,000
Customer deposits (30,000) 2,192,000
Accrued expenses 93,000 (645,000)
Total adjustments (13,210,000) (724,000)
Cash flows used in operating activities (1,649,000) (1,574,000)
Cash flows from investing activities:    
Capital expenditures (1,726,000) (2,184,000)
Cash flows used in investing activities (1,726,000) (2,184,000)
Net decrease in cash and cash equivalents (3,375,000) (3,758,000)
Cash and cash equivalents at:    
Beginning of period 9,581,000 23,232,000
End of period 6,206,000 19,474,000
Non-cash investing and financing activities:    
Operating lease right-of-use assets 352,000 0
Operating lease liabilities $ 352,000 $ 0