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Note 8 - Retirement Plans - Allocation of Plan Assets (Details) | Dec. 31, 2016 | Dec. 31, 2015
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Asset category: |  |
Plan assets, percent | 100.00% | 100.00%
Insurance General Account [Member] |  |
Asset category: |  |
Plan assets, percent | 23.00% | 26.00%
Cash and Cash Equivalents [Member] |  |
Asset category: |  |
Plan assets, percent | 6.00% | 2.00%
Equity Securities [Member] |  |
Asset category: |  |
Plan assets, percent | 39.00% | 54.00%
Fixed Income Securities [Member] |  |
Asset category: |  |
Plan assets, percent | 28.00% | 14.00%
Real Estate [Member] |  |
Asset category: |  |
Plan assets, percent | 4.00% | 4.00%

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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=65897934&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=65897934&loc=d3e1928-114920 + Details
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