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Note 13 - Common Stock and Additional Paid-in Capital (Details Textual) - USD ($)
 12 Months Ended
Aug. 12, 2014
May 07, 2014
Feb. 14, 2014
Apr. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Feb. 26, 2015
Nov. 26, 2014
Mar. 22, 2010
Stock Repurchase Program, Authorized Amount                         $ 10,000,000 $ 15,000,000
Stock Repurchased During Period, Shares               0 0   1,205,229      
Treasury Stock Acquired, Average Cost Per Share         $ 3.10 $ 5.46 $ 6.30     $ 4.05 $ 5.21      
Treasury Stock, Shares, Acquired         657,113 2,372,097 843,022     551,646        
Stock Issued During Period, Shares, New Issues 3,500,000 4,476,195 3,398,558 11,500,000                    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01                
Sale of Stock, Price Per Share $ 10 $ 10.50 $ 9.71 $ 10                    
Proceeds from Issuance or Sale of Equity $ 35,000,000 $ 47,000,047 $ 32,999,998 $ 115,000,000                    
Proceeds from Issuance of Equity, Net of Issuance Costs $ 34,071,501 $ 46,294,133 $ 31,937,044 $ 109,119,029                    
Stock Repurchase Program, Authorized Amount, Additional                       $ 20,000,000