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Supplemental Balance Sheet Disclosures - Unbilled Receivables (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jan. 31, 2016	Sep. 30, 2015
Unbilled receivables
Change in operating income resulting from revised estimates	$ 1,973,116	$ (637,965)	$ 1,664,383	$ (471,650)
Unbilled receivables, net	1,725,273		1,725,273			$ 3,920,209
Inventories valuation
Raw materials	3,231,876		3,231,876			3,346,778
Work-in-process	610,246		610,246			745,311
Finished goods	229,225		229,225			505,227
Inventory, Net, Total	4,071,347		4,071,347			4,597,316
Prepaid expenses and other current assets
Prepaid insurance	431,238		431,238			290,543
Income tax refund receivable	415,940		415,940			386,869
Other	581,862		581,862			544,305
Total	1,429,040		1,429,040			1,221,717
Delta
Unbilled receivables
Provision for loss on unbilled receivables	3,600,000		3,600,000			3,600,000
Unbilled receivables, net						3,600,000
Inventories valuation
Inventory, Net, Total						200,000
A Certain Customer
Unbilled receivables
Provision for loss on unbilled receivables						$ 1,300,000
Unbilled receivables that have been cancelled					$ 1,300,000
Contracts accounted for under percentage of completion
Unbilled receivables
Change in operating income resulting from revised estimates	$ 398,000	$ 354,000	$ 352,000	$ 720,000

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