Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock [Line Items]
Shares Authorized	5,959,100us-gaap_PreferredStockSharesAuthorized	5,959,100us-gaap_PreferredStockSharesAuthorized
Liquidation Preference (in Dollars)	$ 975,000	$ 975,000
Par Value (in Dollars per share)	$ 1.00	$ 1.00
Series H Preferred Stock [Member]
Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock [Line Items]
Shares Authorized	70,000
Shares Outstanding	70,000
Liquidation Preference (in Dollars)	175,000
Dividend Rate	6.90%
Dividend Payout (in Dollars per share)	$ 1.72500
Par Value (in Dollars per share)	$ 1.00
Series I Preferred Stock [Member]
Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock [Line Items]
Shares Authorized	18,400
Shares Outstanding	16,000
Liquidation Preference (in Dollars)	400,000
Dividend Rate	6.00%
Dividend Payout (in Dollars per share)	$ 1.50000
Par Value (in Dollars per share)	$ 1.00
Series J Preferred Stock [Member]
Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock [Line Items]
Shares Authorized	9,000
Shares Outstanding	9,000
Liquidation Preference (in Dollars)	225,000
Dividend Rate	5.50%
Dividend Payout (in Dollars per share)	$ 1.37500
Par Value (in Dollars per share)	$ 1.00
Series K Preferred Stock [Member]
Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock [Line Items]
Shares Authorized	8,050
Shares Outstanding	7,000
Liquidation Preference (in Dollars)	175,000
Dividend Rate	5.625%
Dividend Payout (in Dollars per share)	$ 1.40625
Par Value (in Dollars per share)	$ 1.00
Total [Member]
Note 12 - Preferred Stock (Details) - Outstanding Preferred Stock [Line Items]
Shares Authorized	105,450
Shares Outstanding	102,000
Liquidation Preference (in Dollars)	$ 975,000

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The percentage rate used to calculate dividend payments on preferred stock.

+ References

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- Definition

The amount per share used to calculated dividend payments on preferred stock.

+ References

No definition available.

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- Definition

Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

+ References

No definition available.

+ Details

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ 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 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Number of shares issued which are neither cancelled nor held in the treasury.

+ References

No definition available.

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