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Note 6 - Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
 
Location of Gain
                        
 
Recognized in Income
  
For the Years Ended December 31,
  
(In thousands)
    
2018
    
2017
    
2016
  
Interest rate swap:
Other income (expense)
   $
129
     $
111
     $
113