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Note 12 - Preferred Stock and Common Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 06, 2017
Feb. 28, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Preferred Stock Redemption Premium     $ 7,014 $ 7,014  
Common Stock, Par or Stated Value Per Share     $ 0.01   $ 0.01   $ 0.01
ATM Program, Amount Available     $ 211,900   $ 211,900    
ATM Program [Member]              
Common Stock, Par or Stated Value Per Share   $ 0.01          
Maximum Aggregate Sales Price   $ 500,000          
Stock Issued During Period, Shares, New Issues         0    
Series I Preferred Stock [Member]              
Stock Redeemed or Called During Period, Shares 9,000       9,000,000 [1]    
Percentage of Preferred Stock Redeemed 56.25%            
Preferred Stock Redemption Premium $ 7,000            
[1] On September 6, 2017, the Company partially redeemed 9,000 shares of its issued and outstanding Series I Preferred Stock, representing 56.25% of the issued and outstanding Series I Preferred Stock. In connection with this partial redemption the Company recorded a charge of $7.0 million resulting from the difference between the redemption amount and the carrying amount of the Series I Preferred Stock on the Company’s Condensed Consolidated Balance Sheets in accordance with the FASB’s guidance on Distinguishing Liabilities from Equity. The $7.0 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 nine months ended September 30, 2017.