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Related party transactions (Tables) | 6 Months Ended
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Jun. 30, 2015
Related Party Transactions [Abstract] |
Schedule of related party transactions | A summary of the significant related party transactions for the three and six months ended June 30, 2015 and 2014 is as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2015 | 2014 |  | 2015 | 2014
Net sales to Glencore | $ | 513,681 |  | $ | 288,573 |  |  | $ | 1,089,410 |  | $ | 574,156 |
Purchases from Glencore | 133,642 |  | 60,998 |  |  | 241,456 |  | 124,855 |
Purchases from BHH | 13,434 |  | 13,117 |  |  | 28,253 |  | 27,723 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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