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Unbilled Receivables (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables, net | $ 1,597,672 |  |  |  | $ 3,920,209 |  |  |  | $ 1,597,672 | $ 3,920,209 |
Provision for loss on unbilled receivables |  |  |  |  | 1,300,000 |  |  |  |  | 1,300,000 |
Change in operating income resulting from revised estimates | $ 546,460 | $ 232,344 | $ 1,973,116 | $ (308,733) | $ (2,884,231) | $ (264,862) | $ (637,965) | $ 166,315 | 2,443,187 | (3,620,743) | $ (142,868)
Contracts accounted for under percentage of completion |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Change in operating income resulting from revised estimates |  |  |  |  |  |  |  |  | $ 58,000 | $ (117,000) | $ (1,500,000)

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