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Future minimum lease payments (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Annual minimum payments:    
2021 (October 1 to December 31, 2021) $ 131,395  
2022 (through June 30, 2022) 262,789  
Total minimum payments 394,184  
Less: Present value factor (10,004)  
Total operating lease liabilities 384,180 $ 741,351
Less: Current portion of operating lease (384,180) (483,254)
Long-term portion of operating lease $ 258,097