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Note 5 - Business Segment Reporting (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
      Three Months Ended June 30,   Six Months Ended June 30,
      2018   2017   2018   2017
  Consolidated Revenue:  
(in 000's)
 
(in 000's)
  United States   $
7,565
    $
6,591
 
  $
14,860
    $
13,045
 
  Brazil    
3,101
     
3,023
 
   
6,628
     
6,719
 
  Other    
121
     
70
 
   
234
     
129
 
  Total Revenue   $
10,787
    $
9,684
 
  $
21,722
    $
19,893