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Note 11 - Financial Instruments - Fair Value of Company's Investments (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Vessels held for sale, impairment loss $ 121,165
Fair Value, Nonrecurring [Member] | Vessels [Member]    
Vessel held for sale 3,873,406  
Vessels held for sale, impairment loss 121,165  
Fair Value, Nonrecurring [Member] | Vessels [Member] | Fair Value, Inputs, Level 1 [Member]    
Vessel held for sale  
Fair Value, Nonrecurring [Member] | Vessels [Member] | Fair Value, Inputs, Level 2 [Member]    
Vessel held for sale 3,873,406  
Fair Value, Nonrecurring [Member] | Vessels [Member] | Fair Value, Inputs, Level 3 [Member]    
Vessel held for sale