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Note 7 - Concentration of Revenue
3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Concentration Risk Disclosure [Text Block]
7.
    Concentration of Revenue
The following table indicates the percentage of consolidated revenue represented by each customer that represented more than
10
percent of consolidated revenue in the
three
month periods ended
March 31, 2018
and
2017.
Most of our customers have multi-year contracts with recurring revenue as well as professional services fees that vary by period depending on their business needs.
 
   
Three Months Ended March 31
,
 
   
2018
   
201
7
 
Customer A
   
11.1%
     
11.6%
 
Customer B
   
5.5%
     
13.6%
 
Customer C
   
7.5%
     
15.2%
 
Customer D
   
20.3%
     
14.5%
 
Customer E
   
27.3%
     
−%