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Note 16 - Voyage Expenses and Vessel Operating Expenses - Vessels' Operating Expenses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Crew wages and related costs $ 36,821,527 $ 31,391,419 $ 26,378,730
Insurance 2,421,948 2,415,028 2,028,142
Repairs and maintenance 5,724,148 5,091,916 5,194,476
Spares and consumable stores 8,514,293 7,978,592 7,120,974
Miscellaneous expenses 5,340,920 3,777,670 4,713,014
Total $ 58,822,836 $ 50,654,625 $ 45,435,336