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Note 12 - Shareholders' Equity (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 15, 2010
Aug. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 26, 2016
Oct. 14, 2010
Stock Issued During Period, Shares, Acquisitions 3,360,000            
Stock Issued During Period at Purchase Price Per Share, Acquisition $ 15            
Stock Issued During Period, Value, Acquisitions $ 50,400,000            
Percentage of Shares Sold of Common Stock Issued and Outstanding 87.60%            
Common Stock, Par or Stated Value Per Share $ 0.01   $ 0.01 $ 0.01     $ 2
Common Stock, Shares Authorized 100,000,000   100,000,000 100,000,000      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           500,000  
Treasury Stock, Shares, Acquired   100   72,471      
Treasury Stock Acquired, Average Cost Per Share   $ 17.10   $ 14.04      
Payments of Ordinary Dividends, Common Stock     $ 77,000    
Common Stock, Dividends, Per Share, Declared       $ 0 $ 0