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Note 22 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
First Quarter
    
Second Quarter
    
Third Quarter
    
Fourth Quarter
    
Full Year
  
2018
      
 
      
 
      
 
      
 
      
 
Revenues(1)
   $
44,660
     $
83,493
     $
133,158
     $
123,524
     $
384,835
  
Operating income (loss)(2)
    
5,815
      
6,830
      
6,663
      
(46,522
 )    
(27,214
 )
Net income (loss)(2)
    
4,442
      
1,785
      
2,408
      
(50,682
 )    
(42,047
 )
Basic and diluted net loss per common unit
    
(0.05
 )    
(0.11
 )    
(0.09
 )    
(1.36
 )    
(1.61
 )
                                         
2019
      
 
      
 
      
 
      
 
      
 
Revenues
   $
93,732
     $
94,076
     $
91,756
     $
91,506
     $
371,070
  
Operating income
    
8,040
      
7,235
      
10,962
      
7,945
      
34,182
  
Net income
    
3,757
      
3,356
      
6,959
      
4,340
      
18,412
  
Basic and diluted net income (loss) per common unit
    
(0.06
 )    
(0.07
 )    
0.01
      
(0.05
 )    
(0.17
 )