Supplemental Balance Sheet Disclosures - Property and Equipment (Details)	3 Months Ended
	Dec. 31, 2018 USD ($) aircraft	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)
Property and equipment
Property and equipment, gross	$ 21,278,203		$ 21,238,428
Less: accumulated depreciation and amortization	(12,558,954)		(12,451,691)
Property and equipment, net	8,719,249		8,786,737
Depreciation and amortization for property and equipment	107,000	$ 103,000
Other assets
Intangible assets, net of accumulated amortization of $538,837 and $531,637 at December 31, 2018 and September 30, 2018, respectively	61,400		68,600
Other non-current assets	111,778		113,393
Total other assets	173,178		181,993
Accumulated amortization of intangible assets	538,837		531,637
Impairment charges	0	0
Intangible asset amortization expense	7,000	0
Prepaid software licenses	36,000		38,000
Land
Property and equipment
Property and equipment, gross	1,021,245		2,268,969
Computer equipment
Property and equipment
Property and equipment, gross	2,273,709		5,601,039
Corporate airplanes
Property and equipment
Property and equipment, gross	$ 5,601,039		1,033,779
Number of airplanes depreciated | aircraft	2
Pilatus PC-12
Property and equipment
Number of airplanes depreciated | aircraft	1
Furniture and office equipment
Property and equipment
Property and equipment, gross	$ 1,033,779		5,733,313
Manufacturing facility
Property and equipment
Property and equipment, gross	5,733,313		5,580,083
Equipment
Property and equipment
Property and equipment, gross	5,615,118		$ 1,021,245
prepaid software licenses
Other assets
Intangible asset amortization expense	$ 2,000	$ 0