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Note 12 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax liabilities:    
Property and equipment $ 101,623 $ 102,169
Unrealized gains on securities 3,282 2,894
Prepaid expenses and other 3,303 3,836
Total deferred tax liabilities 108,208 108,899
Deferred tax assets:    
Current expected credit losses 1,986 1,385
Compensated absences 168 215
Self-insurance allowances 1,674 5,746
Other 49 108
Total deferred tax assets 3,877 7,454
Net deferred tax liability $ 104,331 $ 101,445