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10. INCOME TAXES (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current tax expense    
Federal $ 130,248 $ 292,951
State 63,496 175,055
Total current tax expense 193,744 468,006
Deferred tax expense (benefit)    
Federal 591,493 478,106
State 166,886 134,894
Total deferred tax expense 758,378 613,000
Total $ 952,123 $ 1,081,006