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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net income (loss) $ 3,476,000 $ (274,000)
Adjustments to reconcile net income (loss) to cash used in operating activities:    
Purchase of marketable securities (42,080,000) (35,718,000)
Proceeds from sale and maturity of marketable securities 41,427,000 35,326,000
Change in value of marketable securities (1,765,000) (314,000)
Deferred and other income taxes 490,000 13,000
Depreciation and amortization 705,000 750,000
Provision for doubtful accounts 75,000 75,000
Loss on disposal of assets 157,000 0
Changes in assets and liabilities:    
Accounts receivable (1,738,000) (829,000)
Costs and estimated earnings in excess of billings (2,832,000) 678,000
Inventories (3,500,000) (3,846,000)
Prepaid expenses and other current assets 36,000 (1,170,000)
Accounts payable 134,000 1,350,000
Customer deposits 2,523,000 3,453,000
Accrued expenses and other (6,000) (475,000)
Total adjustments (6,374,000) (707,000)
Cash flows used in operating activities (2,898,000) (981,000)
Cash flows from investing activities:    
Capital expenditures (705,000) (1,003,000)
Cash flows used in investing activities (705,000) (1,003,000)
Net decrease in cash and cash equivalents (3,603,000) (1,984,000)
Cash and cash equivalents at:    
Beginning of period 9,581,000 23,232,000
End of period $ 5,978,000 21,248,000
Non-cash investing and financing activities:    
Operating lease right-of-use assets   39,000
Operating lease liabilities   $ 39,000