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Unbilled Receivables: (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables, net of progress payments | $ 3,920,209 |  |  |  | $ 7,425,728 |  |  |  | $ 3,920,209 | $ 7,425,728 |
Change in operating income resulting from revised estimates | $ (2,884,231) | $ (264,862) | $ (637,965) | $ 166,315 | (3,301,032) | $ 659,901 | $ 1,089,640 | $ 1,408,624 | (3,620,743) | (142,868) | $ 1,927,465
Provision for loss on unbilled receivables |  |  |  |  |  |  |  |  | 1,237,841 | 3,680,679 |
Contracts accounted for under percentage of completion |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Change in operating income resulting from revised estimates |  |  |  |  |  |  |  |  | 117,000 | (1,500,000) | $ (444,000)
Delta |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables, net of progress payments |  |  |  |  | $ 3,700,000 |  |  |  |  | 3,700,000 |
Provision for loss on unbilled receivables |  |  |  |  |  |  |  |  | $ 1,300,000 | $ 3,700,000 |

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