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Commitments and Contingencies - Legal proceedings (Details) | Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($)
--- | --- | ---
Legal Proceedings |  |
Unbilled receivables, net of progress payments | $ 1,597,672 | $ 3,920,209
Inventory | $ 3,645,828 | $ 4,597,316
Delta |  |
Legal Proceedings |  |
Number of aircraft | item | 182 |
Unbilled receivables, net of progress payments | $ 3,600,000 |
Inventory | $ 200,000 |

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51655945&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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