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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current:    
Federal $ 8,443 $ 8,885
State 1,280 1,737
Total current income tax provision 9,723 10,622
Deferred:    
Federal 934 189
State 99 16
Total deferred income tax provision 1,033 205
Provision for income taxes $ 10,756 $ 10,827
Effective Income Tax Rate Reconciliation    
Federal statutory rate 21.00% 21.00%
State income taxes, net of federal tax benefit 1.90% 2.80%
Energy efficiency credit (5.20%) (2.30%)
Other   0.70%
Effective tax rate (as a percent) 17.70% 22.20%
Deferred tax assets:    
Allowance for doubtful accounts $ 486 $ 599
Reserve accounts 636 134
State taxes 44 263
Payroll taxes 157 297
Uniform capitalization 58 45
Total deferred tax assets 1,381 1,338
Deferred tax liabilities:    
Installment sale revenue (853) (1,006)
Depreciation (2,998) (1,740)
Accrued interest receivable (518) (526)
Other (16) (37)
Total deferred tax liabilities (4,385) (3,309)
Net deferred tax liabilities $ (3,004) $ (1,971)