Summary of Significant Accounting Policies (Details) - USD ($)			3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Inventory valuation
Raw materials			$ 3,408,742				$ 2,892,366				$ 3,408,742	$ 2,892,366
Work-in-process			775,770				817,051				775,770	817,051
Finished goods			286,182				570,691				286,182	570,691
Inventories			4,470,694				4,280,108				4,470,694	4,280,108
Property and Equipment
Payment to acquire property and equipment											81,281	2,548,612		$ 153,038
Long-Lived Assets
Impairment charges											0	0		0
Contract Balances
Balance at beginning of the year (contract assets)						$ 0					0
Balance at beginning of the year						356,801					356,801
Contract asset additions											80,182	(554,190)		(116,850)
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period											(356,801)
Increases due to invoicing prior to satisfaction of performance obligations											29,231
Balance at end of the year (contract assets)			80,182				0				80,182	0
Balance at end of the year			29,231				356,801				29,231	356,801
Customer Service Revenue
Cost of sales			1,942,734	$ 2,064,617	$ 1,856,921	1,811,847	1,829,328	$ 1,806,980	$ 2,082,347	$ 1,593,268	7,676,119	7,311,923		8,668,348
Gross Profit			$ 2,859,254	$ 2,525,207	$ 2,346,206	$ 2,165,803	$ 1,816,193	$ 1,582,683	$ 1,644,857	$ 1,494,716	$ 9,896,470	$ 6,538,449		$ 8,118,326
Income taxes
U.S. Federal statutory tax rate (as a percent)	21.00%	34.00%									21.00%	24.30%		34.00%
Percentage of limitation on net operating losses	80.00%
Deferred income tax expense due to Tax Cuts and Jobs Act													$ 321,038
Customer Service
Customer Service Revenue
Customer Service Sales											$ 3,553,919	$ 4,047,265		$ 3,232,712
Cost of sales											1,374,227	1,724,167		1,520,146
Gross Profit											$ 2,179,692	2,323,098		$ 1,712,566
Property and equipment except manufacturing facility and the corporate airplane | Minimum
Property and Equipment
Estimated useful lives											3 years
Property and equipment except manufacturing facility and the corporate airplane | Maximum
Property and Equipment
Estimated useful lives											7 years
Corporate airplanes
Property and Equipment
Estimated useful lives											10 years
Hawker Beechcraft B200GT Aircraft
Property and Equipment
Payment to acquire property and equipment												$ 2,400,000
Manufacturing facility
Property and Equipment
Estimated useful lives											39 years