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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operations:    
Net income (loss) $ (1,819,000) $ 3,473,000
Adjustments to reconcile net income (loss) to cash provided by (used in) operations:    
Purchase of marketable securities (384,668,000) (351,062,000)
Proceeds from sale and maturity of marketable securities 383,773,000 348,845,000
Change in value of marketable securities 3,649,000 (1,782,000)
Deferred and other income taxes (2,024,000) 209,000
Depreciation and amortization 1,385,000 1,372,000
Provision for doubtful accounts 60,000 60,000
(Gain) loss on disposal of assets 1,000 (413,000)
Stock-based compensation 253,000 263,000
Changes in assets and liabilities:    
Accounts receivable 514,000 (308,000)
Costs and estimated earnings in excess of billings (2,052,000) (344,000)
Inventories 968,000 453,000
Prepaid expenses 32,000 (54,000)
Accounts payable 582,000 (336,000)
Customer deposits 4,094,000 (1,619,000)
Accrued expenses (236,000) (1,121,000)
Total adjustments 6,331,000 (5,837,000)
Cash flows provided by (used in) operations 4,512,000 (2,364,000)
Cash flows from investing activities:    
Capital expenditures (689,000) (696,000)
Proceeds from sale of property and equipment   685,000
Cash flows used in investing activities (689,000) (11,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 136,000 11,000
Cash flows provided by financing activities 136,000 11,000
Net increase (decrease) in cash 3,959,000 (2,364,000)
Cash and cash equivalents at:    
Beginning of year 7,193,000 9,557,000
End of year $ 11,152,000 $ 7,193,000