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Note 9 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Total assets at fair value | $ 18,231 | $ 16,896
Total liabilities recorded at fair value | 4,505 | 5,224
Supplemental Executive Retirement Plan [Member] |  |
Derivative asset | 13,726 | 11,617
Metal Swaps [Member] |  |
Derivative asset | 4,098 | 4,458
Derivative liability | 4,505 | 5,224
Embedded Customer Derivatives [Member] |  |
Derivative asset | 407 | 766
Interest Rate Swap [Member] |  |
Derivative asset |  | 55
Fair Value, Inputs, Level 1 [Member] |  |
Total assets at fair value | 13,726 | 11,617
Total liabilities recorded at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] |  |
Derivative asset | 13,726 | 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 | 4,505 | 5,279
Total liabilities recorded at fair value | 4,505 | 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 | 4,098 | 4,458
Derivative liability | 4,505 | 5,224
Fair Value, Inputs, Level 2 [Member] | Embedded Customer Derivatives [Member] |  |
Derivative asset | 407 | 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

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