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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operations:    
Net income $ 1,834,000 $ 7,773,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (73,393,000) (112,663,000)
Proceeds from sale and maturity of marketable securities 72,181,000 113,767,000
Change in fair value of marketable securities 4,259,000 (202,000)
Deferred income taxes (2,863,000) (156,000)
Depreciation and amortization 831,000 783,000
Provision for doubtful accounts 25,000 50,000
Stock-based compensation 35,000 35,000
Changes in assets and liabilities:    
Accounts receivable (788,000) (1,469,000)
Costs and estimated earnings in excess of billings 5,046,000 (2,113,000)
Inventories (1,697,000) (1,925,000)
Prepaid expenses and other current assets (1,645,000) 978,000
Accounts payable 2,473,000 317,000
Customer deposits 2,795,000 (543,000)
Accrued expenses 61,000 202,000
Total adjustments 7,320,000 (2,939,000)
Cash flows provided by operating activities 9,154,000 4,834,000
Cash flows used in investing activities:    
Capital expenditures (718,000) (1,260,000)
Cash flows used in investing activities (718,000) (1,260,000)
Net increase in cash 8,436,000 3,574,000
Cash and cash equivalents at:    
Beginning of period 10,302,000 8,012,000
End of period $ 18,738,000 $ 11,586,000