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Concentrations: (Details) (USD $) |  |  |  |  | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 AAI | Nov. 29, 2011 AAI | Sep. 30, 2012 Net sales Major Customers item | Sep. 30, 2011 Net sales Major Customers item | Sep. 30, 2010 Net sales Major Customers item | Sep. 30, 2012 Net sales Major Customers Eclipse Aerospace | Sep. 30, 2011 Net sales Major Customers Eclipse Aerospace | Sep. 30, 2012 Net sales Major Customers FedEx | Sep. 30, 2011 Net sales Major Customers FedEx | Sep. 30, 2010 Net sales Major Customers FedEx | Sep. 30, 2012 Net sales Major Customers National Nuclear Security Administration | Sep. 30, 2010 Net sales Major Customers Lockheed Martin | Sep. 30, 2012 Net sales Major Customers AAI | Sep. 30, 2011 Net sales Major Customers AAI | Sep. 30, 2010 Net sales Major Customers AAI | Sep. 30, 2012 Net sales Major Customers Government contractors and agencies | Sep. 30, 2011 Net sales Major Customers Government contractors and agencies | Sep. 30, 2010 Net sales Major Customers Government contractors and agencies | 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, 2010 Net sales Major Products Air data systems and components | Sep. 30, 2012 Net sales Major Products FPDS | Sep. 30, 2011 Net sales Major Products FPDS | Sep. 30, 2010 Net sales Major Products FPDS | Sep. 30, 2012 Inventory purchases Major Suppliers item | Sep. 30, 2011 Inventory purchases Major Suppliers item
Concentrations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major customers |  |  |  |  | 5 | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major annual customers |  |  |  |  | 3 | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentrations risk (as a percent) |  |  |  |  | 63.00% | 61.00% | 48.00% | 20.00% | 20.00% | 14.00% | 15.00% | 10.00% | 13.00% | 11.00% | 5.00% | 8.00% | 8.00% | 45.00% | 30.00% | 43.00% | 13.00% | 21.00% | 32.00% | 87.00% | 79.00% | 68.00% | 20.00% | 27.00%
Accounts receivable | $ 3,978,512 | $ 3,124,114 | $ 760,000 | $ 760,000 | $ 1,700,000 | $ 1,800,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major suppliers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for doubtful accounts | $ 200,000 | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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