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Note 9 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Total assets at fair value | $ 20,190 | $ 16,896
Total liabilities recorded at fair value | 5,920 | 5,224
Supplemental Executive Retirement Plan [Member] |  |
Derivative asset | 14,814 | 11,617
Metal Swaps [Member] |  |
Derivative asset | 5,376 | 4,458
Metal swaps | 5,308 | 5,224
Embedded Customer Derivatives [Member] |  |
Derivative asset |  | 766
Metal swaps | 68 |
Interest Rate Swap [Member] |  |
Derivative asset |  | 55
Forward Interest Rate Hedge [Member] |  |
Metal swaps | 544 |
Fair Value, Inputs, Level 1 [Member] |  |
Total assets at fair value | 14,814 | 11,617
Total liabilities recorded at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] |  |
Derivative asset | 14,814 | 11,617
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member] |  |
Derivative asset | 0 | 0
Metal swaps | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Embedded Customer Derivatives [Member] |  |
Derivative asset |  | 0
Metal swaps | 0 |
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Derivative asset |  | 0
Fair Value, Inputs, Level 1 [Member] | Forward Interest Rate Hedge [Member] |  |
Metal swaps | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Total assets at fair value | 5,376 | 5,279
Total liabilities recorded at fair value | 5,920 | 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 | 5,376 | 4,458
Metal swaps | 5,308 | 5,224
Fair Value, Inputs, Level 2 [Member] | Embedded Customer Derivatives [Member] |  |
Derivative asset |  | 766
Metal swaps | 68 |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Derivative asset |  | 55
Fair Value, Inputs, Level 2 [Member] | Forward Interest Rate Hedge [Member] |  |
Metal swaps | 544 |
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
Metal swaps | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Embedded Customer Derivatives [Member] |  |
Derivative asset |  | 0
Metal swaps | 0 |
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Derivative asset |  | $ 0
Fair Value, Inputs, Level 3 [Member] | Forward Interest Rate Hedge [Member] |  |
Metal swaps | $ 0 |

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