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Note 16 - Financial Instruments (Details Textual)
 12 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Dec. 20, 2016
Vessel Profit Participation Liability, Noncurrent   $ 1,067,500      
Asset Impairment Charges, Total   $ 4,595,819    
Long-term Debt, Fair Value   87,100,000        
Difference Between Fair Value and Carrying Value   3,100,000        
Long-term Debt, Total   $ 90,200,000        
M/V Monika P. [Member]            
Profit Sharing Agreement, Percentage           35.00%
Vessel Profit Participation Liability, Noncurrent     $ 1,067,500   $ 950,000  
Assets Held-for-sale, Not Part of Disposal Group, Total $ 8,230,000          
Assets Held-for-sale, Long Lived, Fair Value Disclosure 5,000,000          
Estimated cost to sell, property 100,000          
Asset Impairment Charges, Total 3,330,000          
M/V Aggeliki P. [Member]            
Assets Held-for-sale, Not Part of Disposal Group, Total 5,390,000          
Assets Held-for-sale, Long Lived, Fair Value Disclosure 4,300,000          
Estimated cost to sell, property 170,000          
Asset Impairment Charges, Total $ (1,260,000)          
Interest Rate Swap [Member]            
Derivative, Number of Instruments Held, Total     1      
Derivative, Notional Amount     $ 10,000,000