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Future minimum lease payments (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Annual minimum payments:    
2021 (July 1 to December 31, 2021) $ 262,789  
2022 (through June 30, 2022) 262,789  
Total minimum payments 525,578  
Less: Present value factor (17,250)  
Total operating lease liabilities 508,328 $ 741,351
Less: Current portion of operating lease (508,328) (483,254)
Long-term portion of operating lease $ 258,097