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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Income Taxes        
Change in tax status net deferred tax liability $ 2,066      
Current:        
Federal   $ 8,885 $ 7,849  
State   1,737 973  
Total current income tax provision   10,622 8,822  
Deferred:        
Federal   189 (70)  
State   16 (6)  
Total deferred income tax provision   205 (76)  
Provision for income taxes   $ 10,827 $ 8,746  
Effective Income Tax Rate Reconciliation        
Federal statutory rate 21.00% 21.00% 21.00% 35.00%
State income taxes, net of federal tax benefit   2.80% 2.00%  
Energy efficiency credit   (2.30%)    
Other   0.70% 0.30%  
Effective tax rate (as a percent)   22.20% 23.30%  
Deferred tax assets:        
Allowance for doubtful accounts   $ 599 $ 547  
Reserve accounts   134 111  
State taxes   263 223  
Payroll taxes   297    
Uniform capitalization   45 45  
Total deferred tax assets   1,338 926  
Deferred tax liabilities:        
Installment sale revenue   (1,006) (1,221)  
Depreciation   (1,740) (969)  
Accrued interest receivable   (526) (465)  
Other   (37) (37)  
Total deferred tax liabilities   (3,309) (2,692)  
Net deferred tax liabilities   $ (1,971) $ (1,766)