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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Retirement Plan’s Weighted Average Asset Allocations - Retirement Plan [Member] | Dec. 31, 2015 | Dec. 31, 2014
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Equity Securities [Member] |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Retirement Plan’s Weighted Average Asset Allocations [Line Items] |  |
Weighted average asset allocation | 70.00% | 68.00%
Debt Securities [Member] |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Retirement Plan’s Weighted Average Asset Allocations [Line Items] |  |
Weighted average asset allocation | 30.00% | 32.00%

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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=58740216&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=58740216&loc=d3e1928-114920 + Details
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