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Note 17 - Preferred Stock, Common Stock and Convertible Unit Transactions - Preferred Stock Redeemed (Details) - Redeemable Series H Preferred Stock [Member]
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
 [1]
Depositary Shares Issued (in shares) | shares 7,000,000
Redemption Amount | $ $ 175
Offering/ Redemption Price (in dollars per share) | $ / shares $ 25
[1] In connection with this redemption the Company recorded a non-cash charge of $5.8 million resulting from the difference between the redemption amount and the carrying amount of the Class H Preferred Stock on the Company's Consolidated Balance Sheets in accordance with the FASB's guidance on Distinguishing Liabilities from Equity. The $5.8 million was subtracted from net income to arrive at net income available to common shareholders and is used in the calculation of earnings per share for the year ended December 31, 2015.