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Property and equipment: (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Property and equipment      
Property and equipment, gross $ 17,255,166 $ 17,043,697  
Less: Accumulated depreciation and amortization (10,040,788) (9,567,335)  
Property and equipment, net 7,214,378 7,476,362  
Depreciation 500,000 500,000 800,000
Computer equipment
     
Property and equipment      
Property and equipment, gross 2,090,556 2,055,128  
Corporate airplane
     
Property and equipment      
Property and equipment, gross 3,082,186 3,082,186  
Furniture and office equipment
     
Property and equipment      
Property and equipment, gross 1,076,849 1,074,279  
Manufacturing facility
     
Property and equipment      
Property and equipment, gross 5,605,616 5,605,616  
Equipment
     
Property and equipment      
Property and equipment, gross 4,378,714 4,205,243  
Land
     
Property and equipment      
Property and equipment, gross $ 1,021,245 $ 1,021,245