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Note 7 - Fair Value of Below Market Time Charters Acquired (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Gain (Loss) on Contract Termination $ 15,984,253 $ 15,984,253 $ (0) $ (0)  
Amortization of Fair Value of Below-market Time Charters Acquired   11,368,879 10,827,595 230,112  
Below Market Time Charters Acquired, Noncurrent   7,580,306 $ 34,933,438    
Below Market Time Charters, Accumulated Amortization   $ 10,111,392      
Below Market Time Charters, Weighted Average Amortization Life (Year)   1 year 6 months 10 days      
Fair Value, Inputs, Level 2 [Member] | M/V Marcos V [Member]          
Below Market Time Charters, Fair Value       $ 17,691,698  
Fair Value, Inputs, Level 2 [Member] | M/V Emmanuel P [Member]          
Below Market Time Charters, Fair Value         $ 15,759,241
Fair Value, Inputs, Level 2 [Member] | M/V Rena P [Member]          
Below Market Time Charters, Fair Value         $ 12,540,206