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10. Notes Receivable (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Note receivable $ 4,017,181 $ 8,023,807  
Allowance for losses (405,313) (405,313)  
Notes receivable, net 3,611,868 $ 7,618,494  
Impaired      
Note receivable 1,640,393   $ 1,640,393
Allowance for losses (1,193,359)   (1,193,359)
Notes receivable, net $ 447,034   $ 447,034