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Note 12 - Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
June 30
, 2017
    
December 31, 20
16
  
(in thousands)
  
Carrying
Amount
   
Fair Value
    
Carrying
Amount
    
Fair Value
  
Short
-Term Debt
    
(58,117
 )    
(58,117
 )    
(42,883
 )    
(42,883
 )
Long
-Term Debt including Current Maturities
    
(532,586
 )    
(588,251
 )    
(538,542
 )    
(583,835
 )