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Note 9 - Net Income Per Limited Partner Unit (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year ended December 31,
  
   
2018
    
2019
  
Net income (loss)
   $
(42,047
 )   $
18,412
  
General partner interest in net income (loss)
    
(512
 )    
337
  
Preferred interest in net income
    
25,115
      
25,115
  
Net loss available to limited partners
   $
(66,650
 )   $
(7,040
 )
                 
Basic and diluted weighted average number of units:
                
Common units
    
40,348
      
40,755
  
Restricted and phantom units
    
1,011
      
1,023
  
Total units
    
41,359
      
41,778
  
                 
Basic and diluted net loss per common unit
   $
(1.61
 )   $
(0.17
 )