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Note 2 - Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended March 31, 2019
   
Three Months Ended March 31, 2018
 
(In thousands)
 
Oil Revenue
    
Gas Revenue
    
NGL Revenue
   
Total Oil and Natural Gas Revenues
   
Oil Revenue
    
Gas Revenue
    
NGL Revenue
   
Total Oil and Natural Gas Revenues
 
                                                                 
Operated   $
2,711
     $
20,174
     $
-
     $
22,885
     $
3,799
     $
5,801
     $
-
     $
9,600
  
Non-operated    
75
      
6,182
      
4
      
6,261
      
143
      
2,096
      
4
      
2,243
  
Total oil and natural gas revenues
   $
2,786
     $
26,356
     $
4
     $
29,146
     $
3,942
     $
7,897
     $
4
     $
11,843