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Note 3 - Vessels, Net (Details Textual) - USD ($)
 6 Months Ended 9 Months Ended
Sep. 17, 2020
Jul. 13, 2020
Jul. 06, 2020
Jun. 19, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Proceeds from Sale of Property, Plant, and Equipment, Total           $ 9,752,649
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property           1,305,016
M/V EM Oinousses [Member]              
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 3,700,000        
Property, Plant, and Equipment, Fair Value Disclosure         $ 3,870,000 3,700,000  
Impairment of Long-Lived Assets to be Disposed of         120,000 100,000  
Assets Held-for-sale, Not Part of Disposal Group, Current, Total         3,770,000 3,800,000  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property           (100,000)  
M/V Manolis P [Member]              
Proceeds from Sale of Property, Plant, and Equipment, Total       $ 2,000,000      
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property       $ 300,000      
Advance Received for Vessel Held for Sale           $ 1,133,817  
M/V Kuo Hsiung [Member]              
Proceeds from Sale of Property, Plant, and Equipment, Total   $ 1,900,000          
Assets Held-for-sale, Not Part of Disposal Group, Current, Total         $ 1,600,000    
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property   $ 300,000          
Ninos [Member]              
Proceeds from Sale of Property, Plant, and Equipment, Total $ 2,300,000            
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ 800,000