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Supplemental Balance Sheet Disclosures (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2013
Supplemental Balance Sheet Disclosures |  |  |  |  |
Unbilled receivables, net of customer payments | $ 8,260,342 |  | $ 8,260,342 |  | $ 6,539,442
Inventories |  |  |  |  |
Raw materials | 3,784,599 |  | 3,784,599 |  | 3,126,592
Work-in-process | 1,377,674 |  | 1,377,674 |  | 857,602
Finished goods | 243,100 |  | 243,100 |  | 393,319
Inventory | 5,405,373 |  | 5,405,373 |  | 4,377,513
Prepaid expenses and other current assets |  |  |  |  |
Prepaid insurance | 359,670 |  | 359,670 |  | 350,913
Other | 304,787 |  | 304,787 |  | 291,297
Total | 664,457 |  | 664,457 |  | 642,210
Unbilled receivables |  |  |  |  |
Change in operating income resulting from revised estimates | (1,089,640) | (1,210,837) | (2,498,264) | (1,595,427) |
Contracts accounted for under percentage of completion |  |  |  |  |
Unbilled receivables |  |  |  |  |
Change in operating income resulting from revised estimates | $ 443,000 | $ 328,000 | $ 614,000 | $ 112,000 |

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