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Related party transactions (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jul. 19, 2012
Related Party Transaction [Line Items]
Sales to major customer, percent of revenues	29.00%	38.00%
Payments to supplier, percent of purchases	36.00%	19.00%
Due to NTR	$ 2,453,812		$ 1,278,000
Credit facility amount, maximum				7,500,000
Interest rate, credit				2.00%
Outstanding balance of credit facility	3,583,358		3,583,358
Estate Gold [Member]
Related Party Transaction [Line Items]
Percentage of ownership by the related party in the entity	25.00%
Proceeds from related party	16,641	59,046
Related party revenue	8,214	67,871
Purchases from related party	$ 23,342

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Amount borrowed under the credit facility as of the balance sheet date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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