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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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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.

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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

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale equity securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

-Paragraph 2

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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)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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