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Note 15 - Voyage Expenses and Vessel Operating Expenses (Tables)

12 Months Ended

Dec. 31, 2014

Voyage Expenses And Vessel Operating Expenses [Abstract]

Voyage Expenses [Table Text Block]

		Year ended December 31,
Voyage Expenses		2012				2013				2014
Port expenses			1,749,565				2,067,494				2,278,961
Bunkers			7,253,583				8,347,130				7,553,318
Commissions			3,304,220				3,244,939				3,725,645
Other voyage expenses			396,382				643,067				529,587

Total			12,703,750				14,302,630				14,087,511

Vessels' Operating Expenses [Table Text Block]

		Year ended December 31,
Vessels’ Operating Expenses		2012				2013				2014
Crew wages and related costs			19,304,929				22,138,595				26,378,730
Insurance			1,260,289				1,667,915				2,028,142
Repairs and maintenance			3,026,513				4,243,133				5,194,476
Spares and consumable stores			5,313,053				5,757,455				7,120,974
Miscellaneous expenses			1,687,193				2,716,455				4,713,014

Total			30,591,977				36,523,553				45,435,336