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Consolidated Statements Of Cash Flows (USD $)
 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Cash flows from operations:    
Net income $ 224,000 $ 2,969,000
Adjustments to reconcile net income to cash provided (used) by operations:    
Purchase of marketable securities (89,242,000) (76,062,000)
Proceeds from sale and maturity of marketable securities 87,531,000 62,273,000
Change in value of marketable securities 2,553,000 (1,949,000)
Deferred income taxes (3,052,000) 6,000
Depreciation and amortization 890,000 905,000
Income from investees   (163,000)
Provision for doubtful accounts 190,000 630,000
Loss on sale of assets   2,000
Gain on legal settlement   (738,000)
Stock-based compensation 47,000  
Change in assets and liabilities:    
Accounts receivable 468,000 3,081,000
Costs and estimated earnings in excess of billings (3,870,000) 3,950,000
Inventories 4,463,000 4,962,000
Prepaid expenses 573,000 (651,000)
Account payable 605,000 (969,000)
Customer deposits (722,000) 692,000
Accrued expenses and other (481,000) 765,000
Total adjustments (47,000) (3,266,000)
Cash flows provided (used) by operations 177,000 (297,000)
Cash flows from investing activities:    
Distributions from unconsolidated investees   163,000
Capital expenditures, net of disposals (1,466,000) (539,000)
Cash flows used by investing activities (1,466,000) (376,000)
Net decrease in cash (1,289,000) (673,000)
Cash and cash equivalents at:    
Beginning of period 3,004,000 3,677,000
End of period $ 1,715,000 $ 3,004,000