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Note 6 - Instruments and Risk Management (Tables)
12 Months Ended
Dec. 31, 2019
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)
   
2019
   
2018
   
2017
 
Interest rate swap:
Other income (expense)
  $
    $
129
    $
111