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Note 9 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Plan Fair Value Assets | $ 50,649 | $ 46,600
Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 28,304 | 16,142
Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 22,345 | 30,458
Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 0 | 0
Equity Securities [Member] |  |
Plan Fair Value Assets | 13,660 | 7,157
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 13,660 | 7,157
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 0 | 0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 0 | 0
Fixed Income Securities [Member] |  |
Plan Fair Value Assets | 27,492 | 32,097
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 8,913 | 5,052
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 18,579 | 27,045
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 0 | 0
Mutual Funds [Member] |  |
Plan Fair Value Assets | 3,684 | 2,406
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 3,684 | 2,406
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 0 | 0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 0 | 0
Cash and Cash Equivalents [Member] |  |
Plan Fair Value Assets | 5,813 | 4,940
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 2,047 | 1,527
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 3,766 | 3,413
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | $ 0 | $ 0

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