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Note 13 - Geographic Sales Information
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Segment Reporting Disclosure [Text Block]
13.
Geographic Sales Information
 
The United States was the only country to contribute more than
10
percent of total revenues in each fiscal year. The Company’s revenues are substantially denominated in U.S. dollars and are summarized geographically as follows:
 
   
Year ended December 31,
 
   
2017
   
2016
   
201
5
 
United States
  $
24,569
    $
31,838
    $
39,563
 
All other countries
   
17,235
     
16,799
     
18,233
 
Total
  $
41,804
    $
48,637
    $
57,796