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Note 12 - Subsequent Events (Details Textual)
1 Months Ended 6 Months Ended
Aug. 08, 2019
USD ($)
Aug. 08, 2019
USD ($)
Aug. 05, 2019
USD ($)
Jul. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Rate
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Payments to Acquire Property, Plant, and Equipment, Total             $ 1,867
Proceeds from Issuance of Long-term Debt, Total             $ 12,000,000 $ 4,250,000
Subsequent Event [Member]                
Proceeds from Issuance of Long-term Debt, Total         $ 16,167,680,000,000      
Subsequent Event [Member] | Piraeus Bank S.A. [Member]                
Proceeds from Issuance of Long-term Debt, Total       $ 3,667,680        
Debt Instrument, Periodic Payment, Total       160,460        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid       $ 1,742,160        
Subsequent Event [Member] | Piraeus Bank S.A. [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate       3.50%        
Subsequent Event [Member] | HSBC Bank PLC [Member]                
Proceeds from Issuance of Long-term Debt, Total $ 12,500,000 $ 9,000,000 $ 3,500,000          
Debt Instrument, Periodic Payment, Total 450,000              
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid $ 6,200,000 $ 6,200,000            
Subsequent Event [Member] | HSBC Bank PLC [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate 2.95%              
Subsequent Event [Member] | Four Feeder Containerships [Member]                
Number of Vessels Acquired           4    
Payments to Acquire Property, Plant, and Equipment, Total           $ 15,000,000    
Stock Issued During Period, Shares, Purchase of Assets | shares           22,535,210    
Shares Issued, Percent of Outsanding Shares of the Company | Rate           6430.00%