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Note 9 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Plan Fair Value Assets | $ 72,658 | $ 77,067
Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 25,032 | 26,398
Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 47,487 | 50,649
Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 139 | 20
Equity Securities [Member] |  |
Plan Fair Value Assets | 10,979 | 12,639
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 10,979 | 12,619
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 | 20
Fixed Income Securities [Member] |  |
Plan Fair Value Assets | 51,081 | 55,045
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 8,788 | 9,582
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 42,154 | 45,463
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 139 | 0
Mutual Funds [Member] |  |
Plan Fair Value Assets | 3,045 | 2,108
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 3,045 | 2,108
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets |  | 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 | 7,553 | 7,275
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 2,220 | 2,089
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 5,333 | 5,186
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | $ 0 | $ 0

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