XML 37 R29.htm IDEA: XBRL DOCUMENT v3.7.0.1
Note 1 - Basis of Presentation and General Information (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
    2016   2017
A    
27
%    
29
%
B    
30
%    
29
%
C    
13
%    
16
%
D    
18
%    
20
%
Total    
88
%    
94
%