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Concentrations: (Details) (USD $) |  |  | 0 Months Ended |  |  | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Dec. 17, 2013 AAI | Sep. 30, 2013 AAI | Nov. 29, 2011 AAI | Sep. 30, 2013 Net sales Major Customers customer | Sep. 30, 2012 Net sales Major Customers customer | Sep. 30, 2011 Net sales Major Customers customer | Sep. 30, 2013 Net sales Major Customers Eclipse | Sep. 30, 2012 Net sales Major Customers Eclipse | Sep. 30, 2011 Net sales Major Customers Eclipse | Sep. 30, 2012 Net sales Major Customers FedEx | Sep. 30, 2011 Net sales Major Customers FedEx | Sep. 30, 2012 Net sales Major Customers National Nuclear Security Administration | Sep. 30, 2013 Net sales Major Customers AAI | Sep. 30, 2012 Net sales Major Customers AAI | Sep. 30, 2011 Net sales Major Customers AAI | Sep. 30, 2013 Net sales Major Customers Government contractors and agencies | Sep. 30, 2012 Net sales Major Customers Government contractors and agencies | Sep. 30, 2011 Net sales Major Customers Government contractors and agencies | Sep. 30, 2013 Net sales Major Products Air data systems and components | Sep. 30, 2012 Net sales Major Products Air data systems and components | Sep. 30, 2011 Net sales Major Products Air data systems and components | Sep. 30, 2013 Net sales Major Products FPDS | Sep. 30, 2012 Net sales Major Products FPDS | Sep. 30, 2011 Net sales Major Products FPDS | Sep. 30, 2013 Inventory purchases Major Suppliers supplier | Sep. 30, 2012 Inventory purchases Major Suppliers supplier
Concentrations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major customers |  |  |  |  |  | 5 | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major annual customers |  |  |  |  |  | 2 | 3 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentrations risk (as a percent) |  |  |  |  |  | 64.00% | 63.00% | 61.00% | 24.00% | 20.00% | 20.00% | 14.00% | 15.00% | 13.00% | 14.00% | 5.00% | 8.00% | 28.00% | 45.00% | 30.00% | 12.00% | 13.00% | 21.00% | 88.00% | 87.00% | 79.00% | 30.00% | 20.00%
Accounts receivable and unbilled receivables |  |  |  |  |  | $ 5,900,000 | $ 2,400,000 | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 4,489,434 | 3,978,512 |  | 760,000 | 760,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collection of accounts receivable |  |  | 760,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major suppliers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for doubtful accounts | $ 0 | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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