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Note 12 - Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31, 2018
    
December 31, 2017
  
(in thousands)
  
Carrying
Amount
    
Fair Value
    
Carrying
Amount
    
Fair Value
  
Cash and Cash Equivalents
   $
861
     $
861
     $
16,216
     $
16,216
  
Short-Term Debt
    
(18,599
 )    
(18,599
 )    
(112,371
 )    
(112,371
 )
Long-Term Debt including Current Maturities
    
(590,174
 )    
(601,513
 )    
(490,566
 )    
(543,691
 )