Summary of Significant Accounting Policies (Details) - USD ($)				1 Months Ended	3 Months Ended								12 Months Ended
	Sep. 04, 2020	Jan. 01, 2018	Dec. 22, 2017	Mar. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Restricted Cash
Cash dividends declared per share	$ 0.65
Total cash dividend payment													$ 11,200,000
Cash and cash equivalents					$ 12,603,967				$ 22,416,830				12,603,967	$ 22,416,830
Restricted cash					11,180,900				0				11,180,900	0
Total cash and cash equivalents and restricted cash					23,784,867				22,416,830				23,784,867	22,416,830	$ 20,390,713		$ 24,680,301
Inventory Valuation
Raw materials					3,378,246				3,408,742				3,378,246	3,408,742
Work-in-process					656,382				775,770				656,382	775,770
Finished goods					256,707				286,182				256,707	286,182
Inventories					4,291,335				4,470,694				4,291,335	4,470,694
Property and Equipment
Payment to acquire property and equipment													118,797	81,281	2,548,612
Long-Lived Assets
Impairment charges													0	0	0
Contract Balances
Balance at beginning of the period (contract assets)								$ 80,182					80,182
Balance at beginning of the period (contract liabilities)								29,231					29,231
Amount transferred to receivables from contract assets													(80,182)
Contract asset additions													(80,182)	80,182	(554,190)
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period													(28,781)
Increases due to invoicing prior to satisfaction of performance obligations													312,915
Balance at end of the period (contract assets)					0				80,182				0	80,182
Balance at end of the period (contract liabilities)					313,365				29,231				313,365	29,231
Customer Service Revenue
Customer Service Cost of Sales					2,784,533	$ 2,559,016	$ 2,539,894	1,909,781	1,942,734	$ 2,064,617	$ 1,856,921	$ 1,811,847	9,793,224	7,676,119	7,311,923
Gross Profit					$ 3,510,484	$ 3,394,673	2,295,171	$ 2,601,647	$ 2,859,254	$ 2,525,207	$ 2,346,206	$ 2,165,803	$ 11,801,975	$ 9,896,470	$ 6,538,449
Income taxes
U.S. Federal statutory tax rate (as a percent)		21.00%	34.00%										21.00%	21.00%	24.30%
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													$ 4,265,086	$ 3,553,919	$ 4,047,265
Customer Service Cost of Sales													1,457,995	1,374,227	1,724,167
Gross Profit													$ 2,807,091	$ 2,179,692	2,323,098
COVID 19
Income taxes
Amount of pre-tax NOL carried back two years to fully offset taxable income				$ 1,500,000			1,500,000
AMT tax				16,000			16,000
Cash impact of carryback				309,412
COVID 19 | R&D
Income taxes
Increase in R&D credit carryforward				$ 196,000			$ 196,000
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