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Note 17 - Voyage Expenses and Vessel Operating Expenses - Vessels' Operating Expenses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Crew wages and related costs $ 37,345,800 $ 36,821,527 $ 31,391,419
Insurance 2,016,647 2,421,948 2,415,028
Repairs and maintenance 6,424,557 5,724,148 5,091,916
Spares and consumable stores 8,508,276 8,514,293 7,978,592
Miscellaneous expenses 5,124,154 5,340,920 3,777,670
Total $ 59,419,434 $ 58,822,836 $ 50,654,625