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Summary of Significant Accounting Policies - Concentration Risk (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2018 customer item	Jun. 30, 2017 customer item	Jun. 30, 2018 customer item	Jun. 30, 2017 customer item
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2		2
Net sales | Major Customers and Products
Concentrations
Number of major customers | customer	3	2	1	3
Net sales | Major Customers and Products | Pilatus Aircraft Ltd ("Pilatus")
Concentrations
Sales percentage	26.00%		17.00%
Net sales | Major Customers and Products | L3
Concentrations
Sales percentage	15.00%
Net sales | Major Customers and Products | DoD
Concentrations
Sales percentage	12.00%
Net sales | Major Customers and Products | Kanematsu
Concentrations
Sales percentage		30.00%		11.00%
Net sales | Major Customers and Products | Sierra Nevada
Concentrations
Sales percentage		15.00%		20.00%
Net sales | Major Customers and Products | DHL
Concentrations
Sales percentage				13.00%
Inventory | Major Suppliers
Concentrations
Number of major suppliers	3	0	2	2

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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