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Summary of Significant Accounting Policies (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 10, 2020 $ / shares | Sep. 04, 2020 $ / shares | Jan. 01, 2018 | Dec. 22, 2017 | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) segment | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($)
Number of business segments |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments in which the entity operates | segment |  |  |  |  |  |  |  | 1 |  |  |  |
Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |
Contract Balances |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period (contract liabilities) |  |  |  |  |  | $ 313,365 |  | 313,365 |  |  |  |
Amount transferred to receivables from contract assets |  |  |  |  |  |  |  | 0 |  |  |  |
Contract asset additions |  |  |  |  |  |  |  | 0 |  |  |  |
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period |  |  |  |  |  |  |  | (305,494) |  |  |  |
Increases due to invoicing prior to satisfaction of performance obligations |  |  |  |  |  |  |  | 1,520,823 |  |  |  |
Balance at end of the period (contract liabilities) |  |  |  |  | 1,528,694 |  |  | 1,528,694 |  | $ 313,365 |  |
Customer Service Revenue |  |  |  |  |  |  |  |  |  |  |  |
Customer Service Cost of Sales |  |  |  |  | 2,825,681 |  | $ 2,559,016 | 7,348,364 | $ 7,008,691 |  |  |
Gross profit |  |  |  |  | 3,354,502 |  | 3,394,673 | $ 8,823,316 | 8,291,491 |  |  |
Income Taxes |  |  |  |  |  |  |  |  |  |  |  |
U.S. Federal statutory tax rate (as a percent) |  |  | 21.00% | 34.00% |  |  |  | 21.00% |  |  |  |
Net operating losses (as a percent) |  |  |  |  |  |  |  |  |  |  | 80.00% |
Deferred income tax expense |  |  |  |  |  |  |  |  |  |  | $ 321,038 |
Engineering Development |  |  |  |  |  |  |  |  |  |  |  |
Percentage of employees who were engineers engaged in various engineering development projects |  |  |  |  |  |  |  | 21.00% |  |  |  |
Warranty |  |  |  |  |  |  |  |  |  |  |  |
Length of warranty period |  |  |  |  |  |  |  | 24 months |  |  |  |
Self-Insurance Reserves |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability for medical claims incurred but not reported |  |  |  |  | 46,700 |  |  | $ 46,700 |  | 48,200 |  |
Excess of funded premiums over estimated claims incurred but not reported |  |  |  |  | 180,200 |  |  | 180,200 |  | 225,200 |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share | $ / shares | $ 0.50 | $ 0.65 |  |  |  |  |  |  |  |  |  |
Total cash dividend payment |  |  |  |  |  |  |  | 8,600,000 |  | 11,200,000 |  |
Dividends paid |  |  |  |  |  | $ 8,607,192 |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 7,482,863 |  |  | 7,482,863 |  | 12,603,967 |  |
Restricted cash |  |  |  |  | 0 |  |  | 0 |  | 11,180,900 |  |
Total cash and cash equivalents and restricted cash |  |  |  |  | 7,482,863 |  | 22,984,249 | 7,482,863 | 22,984,249 | $ 23,784,867 |  | $ 22,416,830
Customer one |  |  |  |  |  |  |  |  |  |  |  |
Contract Balances |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of the period (contract liabilities) |  |  |  |  | 1,456,000 |  |  | 1,456,000 |  |  |  |
Customer Service |  |  |  |  |  |  |  |  |  |  |  |
Customer Service Revenue |  |  |  |  |  |  |  |  |  |  |  |
Customer Service Sales |  |  |  |  | 980,845 |  | 906,662 | 3,010,720 | 3,302,346 |  |  |
Customer Service Cost of Sales |  |  |  |  | 408,161 |  | 320,428 | 1,079,462 | 1,072,397 |  |  |
Gross profit |  |  |  |  | $ 572,684 |  | $ 586,234 | $ 1,931,258 | $ 2,229,949 |  |  |
Property and equipment except manufacturing facility and the corporate airplane | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  | 3 years |  |  |  |
Property and equipment except manufacturing facility and the corporate airplane | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  | 7 years |  |  |  |
Manufacturing facility |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  | 39 years |  |  |  |
Corporate airplanes |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  | 10 years |  |  |  |

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