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Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $)
 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operations:    
Net income $ 4,833,000 $ 4,646,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (41,816,000) (84,850,000)
Proceeds from sale and maturity of marketable securities 41,519,000 80,360,000
Change in fair value of marketable securities (3,455,000) (2,831,000)
Deferred income taxes 1,365,000 (2,418,000)
Depreciation and amortization 798,000 642,000
Provision for doubtful accounts 366,000 190,000
Stock-based compensation 138,000  
Change in assets and liabilities:    
Accounts receivable (190,000) (140,000)
Cost and estimated earnings in excess of billings 234,000 (3,642,000)
Inventories 895,000 4,159,000
Prepaid expenses 268,000 585,000
Account payable 1,393,000 1,064,000
Customer deposits 1,762,000 1,277,000
Accrued expenses and other 1,708,000 1,346,000
Total adjustments 4,985,000 (4,258,000)
Cash flows provided by operating activities 9,818,000 388,000
Cash flows used in investing activities:    
Capital expenditures (773,000) (969,000)
Cash flows used in investing activities (773,000) (969,000)
Net increase (decrease) in cash 9,045,000 (581,000)
Cash at:    
Beginning of period 1,715,000 3,004,000
End of period $ 10,760,000 $ 2,423,000