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Accounts receivable (Tables) | 12 Months Ended
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Dec. 31, 2013
Receivables [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | December 31, |
|  | 2013 |  | 2012 |
Trade accounts receivable |  | $ | 18,666,283 |  | $ | 12,098,566 |
Receivable from affiliate |  |  | 53,867 |  |  | 110,544 |
Other accounts receivable |  |  | 362,453 |  |  | 530,399 |
|  |  | 19,082,603 |  |  | 12,739,509 |
Allowance for doubtful accounts |  |  | (223,043) |  |  | (223,043) |
|  | $ | 18,859,560 |  | $ | 12,516,466 |
Schedule Of Allowance For Doubtful Accounts Activity [Table Text Block] | The activity for the allowance for doubtful accounts consisted of:
|  | Year ended December 31, |
|  | 2013 |  | 2012 |
Opening allowance for doubtful accounts |  | $ | 223,043 |  | $ | 160,134 |
Provision for doubtful accounts |  |  | 32,933 |  |  | 62,909 |
Accounts written off during the year |  |  | (32,933) |  |  | - |
Ending allowance for doubtful accounts |  | $ | 223,043 |  | $ | 223,043 |

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- Definition Disclosure of accounting policy for schedule of allowance for doubtful accounts activity. + References No definition available. + Details
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- Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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