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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income (loss) $ 7,043,000 $ (1,819,000)
Adjustments to reconcile net income (loss) to cash provided by operating activities:    
Purchase of marketable securities (550,295,000) (384,668,000)
Proceeds from sale and maturity of marketable securities 549,027,000 383,773,000
Change in value of marketable securities (314,000) 3,649,000
Deferred and other income taxes 1,647,000 (2,024,000)
Depreciation and amortization 1,397,000 1,385,000
Provision for doubtful accounts 105,000 60,000
Loss on disposal of assets 65,000 1,000
Stock-based compensation 37,000 253,000
Changes in assets and liabilities:    
Accounts receivable (341,000) 514,000
Costs and estimated earnings in excess of billings (2,525,000) (2,052,000)
Inventories 1,136,000 968,000
Prepaid expenses (781,000) 32,000
Accounts payable (86,000) 582,000
Customer deposits 66,000 4,094,000
Accrued expenses 812,000 (236,000)
Total adjustments (50,000) 6,331,000
Cash flows provided by operating activities 6,993,000 4,512,000
Cash flows from investing activities:    
Capital expenditures (306,000) (689,000)
Cash flows used in investing activities (306,000) (689,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 380,000 136,000
Cash flows provided by financing activities 380,000 136,000
Net increase in cash 7,067,000 3,959,000
Cash and cash equivalents at:    
Beginning of year 11,152,000 7,193,000
End of year $ 18,219,000 $ 11,152,000