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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operations:    
Net income $ 6,110,000 $ 4,809,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (140,032,000) (306,744,000)
Proceeds from sale and maturity of marketable securities 139,275,000 306,339,000
Change in fair value of marketable securities 639,000 (861,000)
Deferred income taxes (967,000) 108,000
Depreciation and amortization 648,000 605,000
Provision for doubtful accounts   50,000
Stock-based compensation 36,000 36,000
Changes in assets and liabilities:    
Accounts receivable (646,000) (632,000)
Costs and estimated earnings in excess of billings (4,160,000) 3,241,000
Inventories 1,611,000 (2,964,000)
Prepaid expenses and other current assets 877,000 309,000
Accounts payable 2,384,000 1,698,000
Customer deposits (3,441,000) 2,795,000
Accrued expenses (15,000) 350,000
Total adjustments (3,791,000) 4,330,000
Cash flows provided by operating activities 2,319,000 9,139,000
Cash flows used in investing activities:    
Capital expenditures (2,709,000) (420,000)
Cash flows used in investing activities (2,709,000) (420,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 340,000 98,000
Cash flows provided by financing activities 340,000 98,000
Net (decrease) increase in cash (50,000) 8,817,000
Cash and cash equivalents at:    
Beginning of period 22,933,000 18,219,000
End of period $ 22,883,000 $ 27,036,000