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Note 9 - Retirement Plans - Pension Plan Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined benefit plan, fair value of plan assets | $ 83,415 | $ 88,248 | $ 80,929
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 66,957 | 71,375 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 16,458 | 16,873 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Insurance General Account [Member] |  |  |
Defined benefit plan, fair value of plan assets | 16,458 | 16,873 |
Insurance General Account [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Insurance General Account [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 16,458 | 16,873 |
Insurance General Account [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] |  |  |
Defined benefit plan, fair value of plan assets | 721 | 3,229 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 721 | 3,229 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Equity Securities [Member] |  |  |
Defined benefit plan, fair value of plan assets | 39,047 | 37,536 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 39,047 | 37,536 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Fixed Income Securities [Member] |  |  |
Defined benefit plan, fair value of plan assets | 25,878 | 27,146 |
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 25,878 | 27,146 |
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Real Estate [Member] |  |  |
Defined benefit plan, fair value of plan assets | 1,311 | 3,464 |
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 1,311 | 3,464 |
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined benefit plan, fair value of plan assets | $ 0 | $ 0 |

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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=108410482&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=108410482&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=108410482&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=112275985&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=108410482&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=108410482&loc=d3e1928-114920 + Details
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