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10. INCOME TAXES (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current tax expense    
Federal $ 292,951 $ 520,984
State 175,055 192,515
Total current tax expense 468,006 713,499
Deferred tax expense (benefit)    
Federal 478,106 (227,632)
State 134,894 (33,141)
Total deferred tax expense (benefit) 613,000 (260,773)
Total $ 1,081,006 $ 452,726