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Note 11 - Marketable Securities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Payments to Acquire Marketable Securities | $ 9,822 | $ 2,466 | $ 257
Proceeds from Sale and Maturity of Marketable Securities | $ 3,146 | $ 1,937 | 76,170
Available-for-sale Securities, Gross Realized Gains |  |  | 39,900
Maximum [Member] |  |  |
Held-to-maturity Securities, Debt Maturities, Period | 5 years |  |
Certain Marketable Securities [Member] |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  |  | $ 76,200

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading 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 (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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