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Note 11 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Interest Rate Swap [Member]    
Derivative Asset $ 300 $ 100
Fair Value, Recurring [Member]    
Total assets at fair value 18,772 16,896
Total liabilities recorded at fair value 3,457 5,224
Fair Value, Recurring [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative Asset 15,061 11,617
Fair Value, Recurring [Member] | Metal Swaps [Member]    
Derivative Asset 3,055 4,458
Derivative liability 3,457 5,224
Fair Value, Recurring [Member] | Embedded Customer Derivatives [Member]    
Derivative Asset 402 766
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Derivative Asset 254 55
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total assets at fair value 15,061 11,617
Total liabilities recorded at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative Asset 15,061 11,617
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member]    
Derivative Asset 0 0
Derivative liability 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Embedded Customer Derivatives [Member]    
Derivative Asset 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Derivative Asset 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total assets at fair value 3,711 5,279
Total liabilities recorded at fair value 3,457 5,224
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative Asset 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member]    
Derivative Asset 3,055 4,458
Derivative liability 3,457 5,224
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Embedded Customer Derivatives [Member]    
Derivative Asset 402 766
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative Asset 254 55
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Total assets at fair value 0 0
Total liabilities recorded at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative Asset 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member]    
Derivative Asset 0 0
Derivative liability 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Embedded Customer Derivatives [Member]    
Derivative Asset 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Derivative Asset $ 0 $ 0