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Note 9 - Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
2020
    
2019
  
   
(in thousands)
  
                 
Operating revenues
   $
2,646
     $
3,125
  
Operating costs and expenses
    
(2,787
)
    
(2,585
)
Depreciation expense
    
-
      
(283
)
Impairment loss
    
(196
)
    
(3,614
)
Loss from discontinued operations
   $
(337
)
   $
(3,357
)