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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operations:    
Net Income $ 4,010,000 $ 4,490,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (220,103,000) (52,657,000)
Proceeds from sale and maturity of marketable securities 218,082,000 52,762,000
Change in fair value of marketable securities (2,458,000) (753,000)
Deferred income taxes 867,000 1,694,000
Depreciation and amortization 1,029,000 881,000
Net gains on disposal of property and equipment (417,000)  
Provision for doubtful accounts 40,000 40,000
Stock-based compensation 199,000 184,000
Changes in assets and liabilities:    
Accounts receivable 11,000 24,000
Costs and estimated earnings in excess of billings (411,000) 783,000
Inventories 1,511,000 24,000
Prepaid expenses and other current assets 170,000 (1,475,000)
Accounts payable (238,000) (186,000)
Customer deposits (1,613,000) 1,089,000
Accrued expenses and other (583,000) (663,000)
Total adjustments (3,914,000) 1,747,000
Cash flows provided by operating activities 96,000 6,237,000
Cash flows provided by (used in) investing activities:    
Capital expenditures (601,000) (1,107,000)
Proceeds from sale of property and equipment 685,000  
Cash flows provided by (used in) investing activities 84,000 (1,107,000)
Net increase in cash 180,000 5,130,000
Cash at:    
Beginning of period 9,557,000 3,361,000
End of period $ 9,737,000 $ 8,491,000