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Note 12 - Subsequent Events (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Repayments of Long-term Debt   $ 927,000 $ 13,852,125
Subsequent Event [Member] | MV EM Astoria [Member]      
Percentage of Bank Financing 100.00%    
Xingang Shipping Ltd. / Joanna Maritime Ltd. [Member] | Subsequent Event [Member]      
Repayments of Long-term Debt $ 1,103,915    
Eirini Shipping Ltd. / Eleni Shipping Ltd. / Areti Shipping Ltd and Pantelis Shipping Corp. [Member] | Subsequent Event [Member]      
Repayments of Long-term Debt $ 400,000