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Note 8 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | $ 580,000 | $ 1,802,000
Reclassification adjustment for gain included in net income, taxes | 0 | (2,000)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 0 | 0
Reclassification adjustment for gain included in net income, taxes | 0 | 0
AOCI Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 580,000 | 1,802,000
Reclassification adjustment for gain included in net income, taxes | $ 0 | $ (2,000)

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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