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Note 9 - Concentration of Credit Risk (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
   
Three Months Ended
 
   
September
30
, 2018
   
September
30
, 2017
 
Customer
 
Net Sales
   
% of Net
Sales
   
Net Sales
   
% of Net
Sales
 
Customer A
  $
2,686,030
     
23.3
%    
3,195,486
     
24.2
%
Customer B
   
2,395,460
     
20.8
%    
2,283,424
     
17.3
%
   
Nine
Months Ended
   
Nine
Months Ended
 
   
September
30, 2018
   
September
30, 2017
 
Customer
 
Net Sales
   
% of Net
Sales
   
Net Sales
   
% of Net
Sales
 
Customer A
  $
10,796,452
     
26.0
%   $
11,489,409
     
27.8
%
Customer B
   
9,737,989
     
23.5
%    
6,457,251
     
15.6
%