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Note 8 - Benefit Plans - Actual and Target Pension Plan Asset Allocation (Details) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Percentage of plan assets | 100.00% | 100.00%
Target allocation | 100.00% |
Equity Securities [Member] |  |
Percentage of plan assets | 52.00% | 68.00%
Target allocation | 52.00% |
Fixed Income Investments [Member] |  |
Percentage of plan assets | 29.00% | 13.00%
Target allocation | 29.00% |
Other than Securities Investment [Member] |  |
Percentage of plan assets | 19.00% | 19.00%
Target allocation | 19.00% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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