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Note 8 - Employee Benefit Plans - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair value, plan assets |  | $ 32,415 | $ 25,007
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 26,040 | 19,125
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets |  | 6,375 | 5,882
Cash [Member] |  |  |
Fair value, plan assets |  | 4,336 | 4,350
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 4,336 | 4,350
Defined Benefit Plan, Equity Securities, US [Member] |  |  |
Fair value, plan assets |  | 15,129 | 11,098
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 15,129 | 11,098
Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value, plan assets |  | 2,735 | 2,334
Defined Benefit Plan, Equity Securities, Non-US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 2,735 | 2,334
Equity Funds [Member] |  |  |
Fair value, plan assets | [1] | 3,840 | 1,343
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets | [1] | 3,840 | 1,343
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair value, plan assets |  | 152 | 202
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets |  | 152 | 202
Corporate Debt Securities [Member] |  |  |
Fair value, plan assets | [2] | 6,223 | 5,680
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets | [2] | $ 6,223 | $ 5,680
[1] | This category comprises actively managed equity funds invested in large-cap and mid-cap U.S. companies.
[2] | This category represents investment grade bonds of U.S. issuers from diverse industries.

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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 (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: 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 7: 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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