Note 14 - Stockholders' Equity (Details) (USD $)
0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
May 03, 2013
Oct. 09, 2012
Sep. 04, 2012
Aug. 21, 2012
Jul. 17, 2012
Dec. 06, 2011
May 31, 2012
Dec. 16, 2011
Jul. 02, 2011
Jul. 14, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Ordinary Income Per Share [Member]
Dec. 31, 2012
Ordinary Income Per Share [Member]
Dec. 31, 2013
Return Of Capital Per Share [Member]
Dec. 31, 2012
Return Of Capital Per Share [Member]
Dec. 31, 2013
Equity Distribution Agreement with JMP Securities [Member]
Jun. 11, 2012
Equity Distribution Agreement with JMP Securities [Member]
Dec. 31, 2013
Series B Preferred Stock [Member]
Dec. 31, 2012
Series B Preferred Stock [Member]
Note 14 - Stockholders' Equity (Details) [Line Items]                                          
Preferred Stock, Shares Authorized (in Shares)                     200,000,000                 3,450,000 3,450,000
Preferred Stock, Par or Stated Value Per Share                     $ 0.01                 $ 0.01 $ 0.01
Preferred Stock, Shares Issued (in Shares)                     3,000,000 0               3,000,000 0
Preferred Stock, Shares Outstanding (in Shares)                     3,000,000 0               3,000,000 0
Stock Issued During Period, Shares, New Issues (in Shares) 13,600,000 15,525,000 1,500,000 10,000,000 5,175,000 2,400,000 3,163,000 360,000 1,500,000 225,000               827,313   3,000,000  
Preferred Stock, Dividend Rate, Percentage                     7.75% 7.75%               7.75%  
Preferred Stock, Liquidation Preference Per Share                                       $ 25 $ 25
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars)                     $ 72,637,000                 $ 72,400,000  
Special Dividend                       $ 0.10                  
Common Stock Taxable Dividends Per Share                     $ 1.08 $ 1.06 $ 1.00 $ 0.81 $ 0.92 $ 0.27 $ 0.14        
Common Stock, Value, Subscriptions (in Dollars)                                     25,000,000    
Proceeds from Issuance of Common Stock (in Dollars) $ 94,434,000 [1] $ 104,144,000 [1] $ 9,765,000 [1] $ 64,892,000 [1] $ 33,150,000 [1] $ 15,422,000 [1] $ 20,031,000 [1] $ 2,360,000 [1] $ 10,325,000 [1] $ 1,603,000 [1] $ 100,551,000 $ 232,668,000 $ 30,382,000         $ 5,800,000      
[1] Proceeds are net of underwriting costs and offering expenses paid by the Company.