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Accounts receivable (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Opening allowance for doubtful accounts	$ 223,043us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 223,043us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provision for doubtful accounts	0us-gaap_ProvisionForDoubtfulAccounts	32,933us-gaap_ProvisionForDoubtfulAccounts	62,909us-gaap_ProvisionForDoubtfulAccounts
Accounts written off during the year	(29,705)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs	(32,933)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Ending allowance for doubtful accounts	$ 193,338us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 223,043us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 223,043us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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-Publisher FASB

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: 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=35738203&loc=d3e5074-111524



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-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 310

-Section 50

-Paragraph 3

-Subparagraph (b)

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Publisher SEC

-Name Regulation S-X (SX)

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