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Note 6 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Repayments of Long-term Debt   $ 927,000 $ 13,852,125  
Limited Dividends Percentage Loans to Profits   60.00%    
Restricted Cash and Cash Equivalents   $ 7,570,000    
Interest Expense   $ 691,498 $ 280,715  
Debt Instrument, Interest Rate During Period   5.31%    
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument Variable Interest Rate   0.94%    
Debt Instrument, Basis Spread on Variable Rate   4.37%    
Current Assets and Long-term Assets [Member]        
Restricted Cash and Cash Equivalents   $ 7,037,958   $ 5,605,740
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