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Note 9 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Plan Fair Value Assets | $ 77,067 | $ 80,285
Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 26,398 | 29,752
Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 50,649 | 50,533
Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 20 | 0
Equity Securities [Member] |  |
Plan Fair Value Assets | 12,639 | 12,986
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 12,619 | 12,986
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 | 20 | 0
Fixed Income Securities [Member] |  |
Plan Fair Value Assets | 55,045 | 57,816
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 9,582 | 11,671
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 45,463 | 46,145
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | 0 | 0
Mutual Funds [Member] |  |
Plan Fair Value Assets | 2,108 | 1,992
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 2,108 | 1,992
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 | 7,275 | 7,491
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 2,089 | 3,103
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 5,186 | 4,388
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets | $ 0 | $ 0

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