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13. Income Tax (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Current:        
Federal     $ 1,812,710 $ 3,551,418
State     696,154 996,510
Deferred:        
Federal     (1,246,828) (1,113,042)
State     (520,999) 46,110
Change in valuation allowance     0 0
Provision for income taxes $ 86,446 $ (1,399,406) $ 741,038 $ 3,480,996