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Note 5 - Business Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
    Three Months Ended September 30,   Nine Months Ended September 30,
    2018   2017   2018   2017
Consolidated Revenue:                
United States   $
7,538
     $
6,857
     $
22,398
     $
19,901
  
Brazil    
3,385
      
3,114
      
10,013
      
9,833
  
Other    
93
      
78
      
327
      
208
  
Total Revenue   $
11,016
     $
10,049
     $
32,738
     $
29,942