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Note 11 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities [Table Text Block] |
|  | December 31, 201 4 |
|  | Amortized Cost |  |  | Gross Unrealized Gains/Losses |  |  | Estimated Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 41,462 |  |  | $ | 46,197 |  |  | $ | 87,659 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 2,576 |  |  |  | (200 | ) |  |  | 2,376 |
Total marketable securities |  | $ | 44,038 |  |  | $ | 45,997 |  |  | $ | 90,035 |
|  | December 31, 201 3 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Estimated Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 33,728 |  |  | $ | 25,995 |  |  | $ | 59,723 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 3,043 |  |  |  | 59 |  |  |  | 3,102 |
Total marketable securities |  | $ | 36,771 |  |  | $ | 26,054 |  |  | $ | 62,825 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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