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Note 13 - Voyage and Vessel Operating Expenses - Summary of Voyage, Vessel, Operating Expenses and Commissions (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Voyage expenses $ 1,055,408 $ 1,261,088 $ 1,564,489
Vessel operating expenses 23,983,282 19,986,170 15,019,342
Port Charges and Canal Dues [Member]      
Voyage expenses 251,197 384,893 1,156,511
Bunkers [Member]      
Voyage expenses 804,211 876,195 407,978
Crew Wages and Related Costs [Member]      
Vessel operating expenses 13,111,682 11,020,924 8,771,386
Insurance [Member]      
Vessel operating expenses 1,844,088 1,537,539 1,261,976
Repairs and Maintenance [Member]      
Vessel operating expenses 1,110,995 1,043,632 643,788
Lubricants [Member]      
Vessel operating expenses 2,029,230 1,665,849 1,169,412
Spares and Consumable Stores [Member]      
Vessel operating expenses 4,758,290 3,445,422 2,391,420
Professional and Legal Fees [Member]      
Vessel operating expenses 259,311 252,156 10,037
Other Vessel Operating Expenses [Member]      
Vessel operating expenses $ 869,686 $ 1,020,648 $ 771,323