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Summary of Significant Accounting Policies (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
item
Jun. 30, 2014
USD ($)
Summary of Significant Accounting Policies        
Number of business segments in which the entity operates | segment     1  
Property and Equipment        
Depreciation $ 138,000 $ 140,000 $ 413,000 $ 414,000
Long-Lived Assets        
Impairment charges     $ 0  
Revenue Recognition        
Minimum number of deliverable for allocating revenue to each deliverable | item     1  
Engineering Development        
Percentage of employees who were engineers engaged in various engineering development projects     35.00%  
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Minimum        
Property and Equipment        
Estimated useful lives     3 years  
Property Plant and Equipment Other than Air Transportation Equipment and Manufacturing Facility | Maximum        
Property and Equipment        
Estimated useful lives     7 years  
Manufacturing Facility        
Property and Equipment        
Estimated useful lives     39 years  
Corporate Airplane        
Property and Equipment        
Estimated useful lives     10 years  
Depreciation     $ 0 $ 0