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Property and equipment: (Details) (USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Property and equipment      
Property and equipment, gross $ 17,694,990 $ 17,255,166  
Less accumulated depreciation and amortization (10,374,495) (10,040,788)  
Property and equipment, net 7,320,495 7,214,378  
Depreciation 500,000 500,000 500,000
Computer equipment
     
Property and equipment      
Property and equipment, gross 2,173,266 2,090,556  
Corporate airplane
     
Property and equipment      
Property and equipment, gross 3,128,504 3,082,186  
Furniture and office equipment
     
Property and equipment      
Property and equipment, gross 1,062,296 1,076,849  
Manufacturing facility
     
Property and equipment      
Property and equipment, gross 5,631,001 5,605,616  
Equipment
     
Property and equipment      
Property and equipment, gross 4,678,678 4,378,714  
Land
     
Property and equipment      
Property and equipment, gross $ 1,021,245 $ 1,021,245