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Note 7 - Net Income Per Limited Partner Unit (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months ended September 30,
    
Nine Months ended September 30,
  
   
2018
    
2019
    
2018
    
2019
  
Net income
   $
2,408
     $
6,959
     $
8,635
     $
14,072
  
General partner interest in net income
    
39
      
110
      
298
      
268
  
Preferred interest in net income
    
6,279
      
6,278
      
18,836
      
18,836
  
Net income (loss) available to limited partners
   $
(3,910
 )   $
571
     $
(10,499
 )   $
(5,032
 )
                                 
Basic and diluted weighted average number of units:
                                
Common units
    
40,380
      
40,811
      
40,331
      
40,735
  
Restricted and phantom units
    
1,090
      
1,130
      
1,019
      
1,004
  
Total units
    
41,470
      
41,941
      
41,350
      
41,739
  
                                 
Basic and diluted net income (loss) per common unit
   $
(0.09
 )   $
0.01
     $
(0.25
 )   $
(0.12
 )