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1. Overview and Summary of Significant Accounting Policies (Details 2) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash $ 13,667,434 $ 4,187,450 $ 1,291,317
Notes receivable 7,618,494 9,702,471  
Level 1      
Cash 13,667,434 4,187,450  
Level 2      
Notes receivable 7,618,494 11,409,709  
Accounts receivable 21,344,499 28,201,279  
Level 3      
Notes receivable - impaired $ 447,034 $ 0