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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
	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale securities
Gross unrealized gains	$ 10,710us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains	$ 9,946us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross unrealized losses	390us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss	17us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Net unrealized gains	$ 10,320us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	$ 9,929us-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

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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

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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

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