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Note 3 - Marketable Equity Securities (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Available-for-sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 5,310,000 | $ 6,402,000 |
Trading Securities, Accumulated Gross Recognized Loss |  | 0 |
Marketable Securities, Reclassification |  | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | 833,000 | 1,000 | $ 29,000
Accumulated Other Comprehensive Income (Loss), Net of Tax | 5,310,000 | 6,402,000 |
Available-for-Sale Securities Net Unrealized Holding Gain (Loss), Net of Tax | 1,079,000 | 237,000 |
Investment Income, Dividend | 1,058,000 | 896,000 | $ 781,000
Trading Securities, Accumulated Gross Recognized Gain |  | 146,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,099,000 | 3,961,000 |
Available-for-sale Equity Securities, Gross Unrealized Loss | 1,332,000 | 390,000 |
Trading Securities Pledged as Collateral | $ 11,949,000 | $ 11,723,000 |
Debt, Weighted Average Interest Rate | 0.94% | 0.76% |

X
- Definition Unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References No definition available. + Details
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- Definition The amount of reclassification during the period among trading securities, securities available-for-sale and securities held-to-maturity. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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