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Note 10 - Business Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2020   2019   2020   2019
Consolidated Revenue:                                
United States   $
3,125
     $
6,807
     $
9,466
     $
13,867
  
Brazil    
164
      
2,358
      
1,145
      
5,001
  
Other    
25
      
124
      
240
      
243
  
Total Revenue   $
3,314
     $
9,289
     $
10,851
     $
19,111