Schedule II Valuation of Qualifying Accounts (Details) - USD ($) |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Schedule II Valuation of Qualifying Accounts | |||
Balance at Beginning of Period | $ 0 | $ 0 | |
Charges (credits) to expense | 32,400 | 0 | $ 0 |
Charges (credits) to other accounts | 0 | 0 | 0 |
Write-offs | 0 | 0 | 0 |
Balance at End of Period | $ 32,400 | $ 0 | $ 0 |