Annual report pursuant to Section 13 and 15(d)

Schedule II: Valuation and Qualifying Accounts (Details)

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Schedule II: Valuation and Qualifying Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]    
Balance at beginning of year $ 1,690,811 $ 1,000,987
Additions to charged to expenses/other accounts 877,119 689,824
Balance at end of year $ 2,567,931 $ 1,690,811