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Note 11 - Marketable Securities | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 11. Marketable Securities: The amortized cost and estimated fair values of securities available-for-sale and held-to-maturity at December 31, 2014 and 2013, are as follows (in thousands):
|  | 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 |
During 2014, 2013 and 2012, the Company received $3.8 million, $26.4 million and $0.2 million in proceeds from the sale/redemption of certain marketable securities, respectively. In connection with these transactions, during 2014, 2013 and 2012 the Company recognized (i) gross realizable gains of $0.0 million, $12.1 million and $0.0 million, respectively, and (ii) gross realizable losses of $0.1 million, $0.0 million and $0.0 million, respectively. As of December 31, 2014, the contractual maturities of debt securities classified as held-to-maturity are as follows: after one year through five years, $1.8 million; and after five years through 10 years, $0.8 million. Actual maturities may differ from contractual maturities as issuers may have the right to prepay debt obligations with or without prepayment penalties.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -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 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -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 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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