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10. INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Provision for income taxes
    Year Ended December 31,  
    2019     2018  
             
Current tax expense:                
Federal   $ 130,248     $ 292,951  
State     63,496       175,055  
                 
      193,744       468,006  
                 
Deferred tax expense (benefit):                
Federal     591,493       478,106  
State     166,886       134,894  
                 
      758,379       613,000  
                 
Total   $ 952,123     $ 1,081,006  
Effective income tax rate differs from the federal statutory rate
    Year Ended December 31,  
    2019     2018  
             
Federal statutory rate     21.00 %     21.00 %
State taxes, net of federal benefit     5.93 %     5.93 %
Permanent differences     0.47 %     0.46 %
Tax credits     0.00 %     0.00 %
Prior year adjustments     -0.01 %     0.12 %
Changes in tax rates and other     0.11 %     -0.07 %
                 
      27.50 %     27.44 %
Deferred tax assets and (liabilities)
    2019     2018  
             
Deferred gain on sale-leaseback   $ -     $ 6,727  
Other     61,319       48,263  
Prepaids     (52,309 )     (40,692 )
Depreciation     (2,493,973 )     (1,989,100 )
Inventory     (473,643 )     (225,425 )
Net noncurrent deferred tax liability     (2,958,606 )     (2,200,227 )
                 
Valuation allowance     -       -  
Net deferred tax liability   $ (2,958,606 )   $ (2,200,227 )