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Note 4 - Marketable securities (Details) - Marketable Securities (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Note 4 - Marketable securities (Details) - Marketable Securities [Line Items] |  |
Adjusted Cost | $ 88,592 | $ 83,553
Unrealized Gains | 10,789 | 5,777
Unrealized Losses | (815) | (1,562)
Fair Value | 98,566 | 87,768
Equity Securities [Member] |  |
Note 4 - Marketable securities (Details) - Marketable Securities [Line Items] |  |
Adjusted Cost | 50,097 | 46,842
Unrealized Gains | 9,355 | 4,307
Unrealized Losses | (731) | (1,550)
Fair Value | 58,721 | 49,599
Preferred Stock [Member] |  |
Note 4 - Marketable securities (Details) - Marketable Securities [Line Items] |  |
Adjusted Cost | 22,769 | 20,418
Unrealized Gains | 987 | 1,068
Fair Value | 23,756 | 21,486
Preferred Non-Convertible Stock [Member] |  |
Note 4 - Marketable securities (Details) - Marketable Securities [Line Items] |  |
Adjusted Cost | 15,726 | 15,143
Unrealized Gains | 447 | 402
Unrealized Losses | (84) | (12)
Fair Value | 16,089 | 15,533
Auction Rate Securities [Member] |  |
Note 4 - Marketable securities (Details) - Marketable Securities [Line Items] |  |
Adjusted Cost |  | 1,150
Fair Value |  | $ 1,150

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in 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 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale 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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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