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LEASES - Future minimum payments (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Future minimum payments under non-cancelable operating leases and financing leases      
Remainder of 2021     $ 26,335
Less imputed interest     (286)
Total operating lease liabilities $ 26,049 $ 38,892 $ 26,049