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Bank Call Loans - Additional Information (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Bank Call Loans [Abstract]      
Broker call rate 2.00%opy_BrokerCallRate 2.00%opy_BrokerCallRate  
Interest expense on bank call loans $ 1,400,000opy_InterestExpenseOnBankCallLoans $ 2,200,000opy_InterestExpenseOnBankCallLoans $ 996,200opy_InterestExpenseOnBankCallLoans