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Note 9 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Total assets at fair value $ 16,597 $ 16,896
Total liabilities recorded at fair value 2,473 5,224
Supplemental Executive Retirement Plan [Member]    
Derivative asset 14,124 11,617
Metal Swaps [Member]    
Derivative asset 2,375 4,458
Derivative liability 2,473 5,224
Embedded Customer Derivatives [Member]    
Derivative asset 98 766
Interest Rate Swap [Member]    
Derivative asset   55
Fair Value, Inputs, Level 1 [Member]    
Total assets at fair value 14,124 11,617
Total liabilities recorded at fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative asset 14,124 11,617
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member]    
Derivative asset 0 0
Derivative liability 0 0
Fair Value, Inputs, Level 1 [Member] | Embedded Customer Derivatives [Member]    
Derivative asset 0 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Derivative asset   0
Fair Value, Inputs, Level 2 [Member]    
Total assets at fair value 2,473 5,279
Total liabilities recorded at fair value 2,473 5,224
Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative asset 0 0
Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member]    
Derivative asset 2,375 4,458
Derivative liability 2,473 5,224
Fair Value, Inputs, Level 2 [Member] | Embedded Customer Derivatives [Member]    
Derivative asset 98 766
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative asset   55
Fair Value, Inputs, Level 3 [Member]    
Total assets at fair value 0 0
Total liabilities recorded at fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member]    
Derivative asset 0 0
Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member]    
Derivative asset 0 0
Derivative liability 0 0
Fair Value, Inputs, Level 3 [Member] | Embedded Customer Derivatives [Member]    
Derivative asset $ 0 0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Derivative asset   $ 0