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Related party transactions (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jul. 19, 2012
Related Party Transaction [Line Items]
Sales to major customer	$ 25,000,000	$ 21,000,000
Sales to major customer, percent of revenues	39.00%	36.00%
Payments to suppliers	12,000,000	10,700,000
Payments to supplier, percent of purchases	22.00%	19.00%
Due to NTR	711,075	677,000
Credit facility amount, maximum			$ 7,500,000
Interest rate, credit			2.00%

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

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