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Related party transactions (Details Textual) (USD $)	3 Months Ended
Related party transactions (Details Textual) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Feb. 26, 2015
Selling, General and Administrative Expenses [Member]
Related Party Transaction [Line Items]
Expense Reimbursement Fees	$ 504,000	$ 480,000
Richmont Capital Partners VM [Member]
Related Party Transaction [Line Items]
Due to Related Parties, Current			$ 425,000

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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