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Accounts receivable | 12 Months Ended
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Dec. 31, 2012
Receivables [Abstract] |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] | 4. Accounts receivable
|  | December 31, |
|  | 2012 |  |  | 2011 |
Trade accounts receivable |  | $ | 12,098,566 |  |  | $ | 8,079,194 |
Receivable from affiliate |  |  | 110,544 |  |  |  | 144,291 |
Other accounts receivable |  |  | 530,399 |  |  |  | 473,881 |
|  |  | 12,739,509 |  |  |  | 8,697,366 |
Allowance for doubtful accounts |  |  | (223,043 | ) |  |  | (160,134 | )
|  | $ | 12,516,466 |  |  | $ | 8,537,232 |
The activity for the allowance for doubtful accounts consisted of:
|  | December 31, |
|  | 2012 |  |  | 2011 |
Opening allowance for doubtful accounts |  | $ | 160,134 |  |  | $ | 160,134 |
Provision for doubtful accounts |  |  | 62,909 |  |  |  | - |
Ending allowance for doubtful accounts |  | $ | 223,043 |  |  | $ | 160,134 |
Significant concentrations of credit risk are disclosed in Note 20.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5162-111524 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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