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Summary of Significant Accounting Policies - Concentration Risk (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2018 customer item	Mar. 31, 2017 customer item	Mar. 31, 2018 customer item	Mar. 31, 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	1	2	1	2
Net sales | Major Customers and Products | Pilatus Aircraft Ltd ("Pilatus")
Concentrations
Sales percentage	17.00%		12.00%
Net sales | Major Customers and Products | Sierra Nevada
Concentrations
Sales percentage		17.00%		23.00%
Net sales | Major Customers and Products | DHL
Concentrations
Sales percentage		34.00%		20.00%
Inventory | Major Suppliers
Concentrations
Number of major suppliers	2	2	1	3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ 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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-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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