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Income/(loss) per common share - (Details 2) (Equity Option)
9 Months Ended
Mar. 31, 2015
Equity Option
 
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Weighted average shares excluded from computation of diluted income per share 275,783us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember