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Changes in capital accounts, textuals (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation Related Costs, Share-based Payments [Abstract]      
Equity Incentive Plan, Number of Shares Authorized 2,392,198us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Shares under the equity incentive plan available for grant 1,764,092us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Equity Incentive Plan, Expiration Date Feb. 21, 2022    
Compensation cost on restricted stock awards $ 341us-gaap_RestrictedStockExpense $ 371us-gaap_RestrictedStockExpense $ 900us-gaap_RestrictedStockExpense
Unrecognized cost for restricted stock awards $ 1,049us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized $ 45us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Period for recognition for unrecognized compensation cost 1 year 4 months 3 days