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Note 11 - Business Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
 
 		  
 		 Three Months Ended
June 30,		  
 		 Six Months Ended
June 30,
    2019   2018   2019   2018
Consolidated Revenue:                                
United States   $
6,807
     $
7,565
     $
13,867
     $
14,860
  
Brazil    
2,358
      
3,101
      
5,001
      
6,628
  
Other    
124
      
121
      
243
      
234
  
Total Revenue   $
9,289
     $
10,787
     $
19,111
     $
21,722