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Note 4 - Marketable securities (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure Text Block Supplement [Abstract] |
Marketable Securities [Table Text Block] |
|  | June 30, 2013 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Equity instruments |  | $ | 50,097 |  |  | $ | 9,355 |  |  | $ | (731 | ) |  | $ | 58,721 |
Preferred stock |  |  | 22,769 |  |  |  | 987 |  |  |  | - |  |  |  | 23,756 |
Trust preferred securities |  |  | 15,726 |  |  |  | 447 |  |  |  | (84 | ) |  |  | 16,089 |
Total |  | $ | 88,592 |  |  | $ | 10,789 |  |  | $ | (815 | ) |  | $ | 98,566 |
|  | December 31, 2012 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Equity instruments |  | $ | 46,842 |  |  | $ | 4,307 |  |  | $ | (1,550 | ) |  | $ | 49,599 |
Preferred stock |  |  | 20,418 |  |  |  | 1,068 |  |  |  | - |  |  |  | 21,486 |
Trust preferred securities |  |  | 15,143 |  |  |  | 402 |  |  |  | (12 | ) |  |  | 15,533 |
Auction rate securities |  |  | 1,150 |  |  |  | - |  |  |  | - |  |  |  | 1,150 |
Total |  | $ | 83,553 |  |  | $ | 5,777 |  |  | $ | (1,562 | ) |  | $ | 87,768 |

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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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