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INCOME TAXES - Tabular (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Current:    
Federal $ 13,763 $ 13,092
State 1,037 1,222
Total current income tax provision 14,800 14,314
Deferred:    
Federal (445) 51
State (79) 10
Total deferred income tax provision (524) 61
Provision for income taxes $ 14,276 $ 14,375
Effective Income Tax Rate Reconciliation    
Federal statutory rate 21.00% 21.00%
State income taxes, net of federal tax benefit 0.90% 1.50%
Energy efficiency credit (1.10%) (5.00%)
Effective tax rate 20.80% 17.50%
Deferred tax assets:    
Allowance for doubtful accounts $ 983 $ 439
Reserve accounts 231 204
State taxes 124 76
Payroll taxes   8
Uniform capitalization 19 15
Other 199 256
Total deferred tax assets 1,556 998
Deferred tax liabilities:    
Installment sale revenue (530) (674)
Depreciation (2,601) (2,808)
Accrued interest receivable (742) (581)
Other (21)  
Total deferred tax liabilities (3,894) (4,063)
Net deferred tax liabilities $ (2,338) $ (3,065)