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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operations:    
Net income $ 6,725,000 $ 4,472,000
Adjustments to reconcile net income to cash provided by operations:    
Purchase of marketable securities (64,516,000) (67,123,000)
Proceeds from sale and maturity of marketable securities 64,068,000 62,363,000
Change in value of marketable securities (1,290,000) (4,129,000)
Deferred income taxes (490,000) 2,161,000
Depreciation and amortization 1,232,000 1,075,000
Provision for doubtful accounts 65,000 366,000
Loss on disposal of assets 25,000 28,000
Stock-based compensation 243,000 189,000
Changes in assets and liabilities:    
Accounts receivable (59,000) 1,000
Costs and estimated earnings in excess of billings 3,448,000 1,002,000
Inventories (2,208,000) 960,000
Prepaid expenses (13,000) 850,000
Account payable (598,000) (97,000)
Customer deposits 1,463,000 (276,000)
Accrued expenses and other (701,000) 675,000
Total adjustments 669,000 (1,955,000)
Cash flows provided by operations 7,394,000 2,517,000
Cash flows from investing activities:    
Capital expenditures (1,198,000) (871,000)
Cash flows used by investing activities (1,198,000) (871,000)
Net increase in cash 6,196,000 1,646,000
Cash and cash equivalents at:    
Beginning of year 3,361,000 1,715,000
End of year $ 9,557,000 $ 3,361,000