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Unbilled Receivables (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Feb. 23, 2017
Unbilled Receivables
Unbilled receivables	$ 1,480,822				$ 1,597,672				$ 1,480,822	$ 1,597,672
Change in operating income resulting from revised estimates	$ (926,999)	$ (541,189)	$ 2,985,918	$ (1,595,295)	546,460	$ 232,344	$ 1,973,116	$ (308,733)	(77,565)	2,443,187	$ (3,620,743)
Contracts accounted for under percentage of completion
Unbilled Receivables
Change in operating income resulting from revised estimates									61,000	58,000	$ (117,000)
Delta
Unbilled Receivables
Reserve					$ 3,600,000					$ 3,600,000
Amount paid												$ 7,750,000
Delta | Selling, general and administrative expenses
Unbilled Receivables
Reversal of reserve									3,600,000
Delta | Other income
Unbilled Receivables
Reminder of amount paid									$ 4,100,000

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- Definition

Amount paid towards reversal of reserve and collection of the unbilled receivables.

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- Definition

The remaining amount paid after reversal of reserve.

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- Definition

Amount of reserves created under unbilled receivables.

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- Definition

Amount of reversal of reserves created under unbilled receivables.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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