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Transactions with Related Parties, Summary (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2018
Transactions with Related Parties [Abstract]        
Management fees $ 29,440 $ 930,500 $ 212,300 $ 111,480
Interest expense 0 305,000 162,500 0
Administration fees 0 400,000 0 0
Assets [Abstract]        
Working capital advances granted to Pavimar   1,559,132 759,386  
Liabilities [Abstract]        
Related party debt   0 5,000,000  
Accrued loan interest   405,000 100,000  
Voyage commissions due   1,941 0  
Pavimar [Member] | Vessel Management Agreements [Member]        
Transactions with Related Parties [Abstract]        
Management fees 29,440 768,000 212,300 111,480
Assets [Abstract]        
Working capital advances granted to Pavimar   1,559,132 759,386  
Alexandria [Member] | Commercial Management Services [Member] | Voyage Expenses [Member]        
Transactions with Related Parties [Abstract]        
Charter hire commissions 0   40,471 0
Thalassa [Member] | Interest and Finance Costs [Member]        
Transactions with Related Parties [Abstract]        
Interest expense 0 305,000 162,500 0
Thalassa [Member] | $5.0 Million Term Loan Facility [Member] | Interest and Finance Costs [Member]        
Transactions with Related Parties [Abstract]        
Interest expense   305,000 100,000  
Thalassa [Member] | $5.0 Million Term Loan Facility [Member] | Vessel Management Agreements [Member]        
Liabilities [Abstract]        
Related party debt   5,000,000 5,000,000  
Accrued loan interest   405,000 100,000  
Castor Ships [Member]        
Liabilities [Abstract]        
Voyage commissions due   1,941 0  
Castor Ships [Member] | Voyage Expenses [Member]        
Transactions with Related Parties [Abstract]        
Charter hire commissions   29,769    
Castor Ships [Member] | General and Administrative Expenses [Member]        
Transactions with Related Parties [Abstract]        
Administration fees 0 400,000 0 0
Castor Ships [Member] | Vessel Management Agreements [Member]        
Transactions with Related Parties [Abstract]        
Management fees 0 162,500 0 0
Sale & purchase commission $ 0 138,600 $ 0 $ 0
Castor Ships [Member] | Commercial Management Services [Member] | Voyage Expenses [Member]        
Transactions with Related Parties [Abstract]        
Charter hire commissions   $ 29,769