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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operations:    
Net income $ 7,397,000 $ 5,319,000
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Purchases of marketable securities (413,993,000) (335,848,000)
Proceeds from sale and maturity of marketable securities 413,491,000 334,844,000
Change in fair value of marketable securities (692,000) (251,000)
Deferred income taxes 6,000 796,000
Depreciation and amortization 862,000 1,050,000
Provision for doubtful accounts 65,000 55,000
Stock-based compensation 54,000 25,000
Changes in assets and liabilities:    
Accounts receivable (338,000) (680,000)
Costs and estimated earnings in excess of billings 24,000 (7,341,000)
Inventories (3,687,000) 1,213,000
Prepaid expenses and other current assets (109,000) 306,000
Accounts payable 803,000 (336,000)
Customer deposits 2,740,000 (810,000)
Accrued expenses and other current liabilities 1,095,000 1,388,000
Total adjustments 321,000 (5,589,000)
Cash flows provided by (used in) provided by operating activities 7,718,000 (270,000)
Cash flows used in investing activities:    
Capital expenditures (854,000) (158,000)
Cash flows used in investing activities (854,000) (158,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 136,000 164,000
Cash flows provided by financing activities 136,000 164,000
Net increase (decrease) in cash 7,000,000 (264,000)
Cash at:    
Beginning of period 18,219,000 11,152,000
End of period $ 25,219,000 $ 10,888,000