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Note 11 - Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
June 30, 2018
    
December 31, 2017
  
(in thousands)
  
Carrying
Amount
    
Fair Value
    
Carrying
Amount
    
Fair Value
  
Cash and Cash Equivalents
   $
1,036
     $
1,036
     $
16,216
     $
16,216
  
Short-Term Debt
    
(20,977
 )    
(20,977
 )    
(112,371
 )    
(112,371
 )
Long-Term Debt including Current Maturities
    
(590,127
 )    
(605,185
 )    
(490,566
 )    
(543,691
 )