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Note 9 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Plan Fair Value Assets | $ 80,285 | $ 72,395
Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 29,752 | 28,059
Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 50,533 | 44,333
Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets |  | 3
Equity Securities [Member] |  |
Plan Fair Value Assets | 12,986 | 10,147
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 12,986 | 10,144
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets |  |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets |  | 3
Fixed Income Securities [Member] |  |
Plan Fair Value Assets | 57,816 | 54,101
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 11,671 | 9,768
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 46,145 | 44,333
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets |  |
Mutual Funds [Member] |  |
Plan Fair Value Assets | 1,992 | 1,777
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 1,992 | 1,777
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets |  |
Cash and Cash Equivalents [Member] |  |
Plan Fair Value Assets | 7,491 | 6,370
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Plan Fair Value Assets | 3,103 | 6,370
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Plan Fair Value Assets | 4,388 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Plan Fair Value Assets |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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