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Note 5 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
(in thousands)
               
Hedge derivative assets
 
June 30,
2015
(1)
   
December 31,
2014
(1)
 
Fair Value of Derivatives
  $ (15,725)     $ (22,720)  
Quoted Prices in Active Markets (Level 1)
    -       -  
Significant Other Observable Inputs (Level 2)
  $ (15,725)     $ (22,720)  
Significant Unobservable Inputs (Level 3)
    -       -