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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Current:    
Federal $ 13,092 $ 8,443
State 1,222 1,280
Total current income tax provision 14,314 9,723
Deferred:    
Federal 51 934
State 10 99
Total deferred income tax provision 61 1,033
Provision for income taxes $ 14,375 $ 10,756
Effective Income Tax Rate Reconciliation    
Federal statutory rate 21.00% 21.00%
State income taxes, net of federal tax benefit 1.50% 1.90%
Energy efficiency credit (5.00%) (5.20%)
Effective tax rate (as a percent) 17.50% 17.70%
Deferred tax assets:    
Allowance for doubtful accounts $ 439 $ 486
Reserve accounts 204 636
State taxes 76 44
Payroll taxes 8 157
Uniform capitalization 15 58
Other 256  
Total deferred tax assets 998 1,381
Deferred tax liabilities:    
Installment sale revenue (674) (853)
Depreciation (2,808) (2,998)
Accrued interest receivable (581) (518)
Other   (16)
Total deferred tax liabilities (4,063) (4,385)
Net deferred tax liabilities $ (3,065) $ (3,004)