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Concentrations: (Details) | 12 Months Ended
--- | ---
Sep. 30, 2015 USD ($) customer item | Sep. 30, 2014 USD ($) customer item | Sep. 30, 2013 USD ($) customer
Concentration of Credit Risk |  |  |
Number of Banks | item | 2 |  |
Provision for loss on unbilled receivables | $ 1,237,841 | $ 3,680,679 |
Net sales | Major Customers |  |  |
Concentrations |  |  |
Number of major customers | customer | 5 | 5 | 5
Number of major annual customers | customer | 2 | 3 | 2
Concentration of risk (as a percent) | 57.00% | 59.00% | 64.00%
Accounts receivable and unbilled receivables | $ 3,500,000 | $ 7,900,000 | $ 5,900,000
Net sales | Major Customers | Pilatus |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 20.00% | 17.00% |
Net sales | Major Customers | Eclipse |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 15.00% | 14.00% | 24.00%
Net sales | Major Customers | Fed Ex |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) |  | 12.00% |
Net sales | Major Customers | AAI |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) |  |  | 14.00%
Net sales | Major Customers | Government contractors and Agencies |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 20.00% | 39.00% | 28.00%
Net sales | Major Products | Air data systems and components |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 2.00% | 12.00% | 12.00%
Net sales | Major Products | FPDS |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 98.00% | 88.00% | 88.00%
Inventory | Supplier Concentration Risk |  |  |
Concentrations |  |  |
Concentration of risk (as a percent) | 43.00% | 15.00% |
Number of major suppliers | item | 1 | 1 |
Delta |  |  |
Concentration of Credit Risk |  |  |
Provision for loss on unbilled receivables | $ 1,300,000 | $ 3,700,000 |

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