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Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year [Line Items] |  |  |
Amortization of prior service benefit | $ (337) | $ (337) | $ 66
Amounts Expected to be Recognized in 2015 [Member] |  |  |
Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year [Line Items] |  |  |
Amortization of net loss | 4,372 |  |
Amortization of prior service benefit | $ (337) |  |

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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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