v3.3.1.900
Major Customers and Suppliers (Tables)
12 Months Ended
Dec. 31, 2015
Risks and Uncertainties [Abstract]  
Schedule of sales of nitrogen fertilizer to major customers
Sales of nitrogen fertilizer to major customers, as a percentage of total net sales, were as follows:
 
December 31,
 
2015
 
2014
 
2013
Nitrogen Fertilizer
 
 
 
 
 
Customer A
10
%
 
17
%
 
15
%
Customer B
14
%
 
10
%
 
13
%
 
24
%
 
27
%
 
28
%