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LEASES, Net Operating Lease Expenses (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Net Operating Lease Expense [Abstract]      
Operating lease expense $ 163,752 $ 314,617  
Sublease income (21,045) (42,090) $ (40,054)
Variable lease expense 1,350 10,352  
Total lease expense $ 144,057 $ 282,879