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Supplemental Balance Sheet Disclosures - Unbilled Receivables (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Unbilled Receivables
Unbilled receivables, net of progress payments	$ 1,039,879		$ 1,039,879		$ 1,480,822
Cumulative change in operating income resulting from changes in estimates	(1,072,228)	$ (541,189)	(3,267,300)	$ 849,435
Inventory valuation
Raw materials	3,223,960		3,223,960		2,920,209
Work-in-process	965,039		965,039		794,756
Finished goods	496,653		496,653		464,689
Inventories	4,685,652		4,685,652		4,179,654
Prepaid expenses and other current assets
Prepaid insurance	254,333		254,333		402,300
Income tax refund receivable	268,890		268,890		260,509
Other	351,152		351,152		429,255
Total prepaid expenses and other current assets	874,375		874,375		$ 1,092,064
Long-term contracts accounted for under percentage-of-completion
Unbilled Receivables
Cumulative change in operating income resulting from changes in estimates	$ 0	$ (45,000)	$ 0	$ 76,000

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