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Note 3 - Marketable Equity Securities (Details) - Unrealized Gains and Losses on Marketable Securities (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Available-for-sale securities |  |
Gross unrealized gains | $ 10,710 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains | $ 9,946 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross unrealized losses | 390 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss | 17 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Net unrealized gains | $ 10,320 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 | $ 9,929 us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1

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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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