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Accounts receivable | 12 Months Ended
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Dec. 31, 2013
Receivables [Abstract] |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] | 4. Accounts receivable
|  | 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 |
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 |
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 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 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=28368275&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 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 6: 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=26873400&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 8: 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=28368275&loc=d3e5162-111524 + Details
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- Details
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