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Note 8 - Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

		December 31,
		2016				2017
Interest on long-term debt			2,660,766				2,839,121
Administrative expenses			206,840				204,472
Other operating costs			—				563,333
Vessel operating and voyage expenses			2,431,873				2,273,553
Total			5,299,479				5,880,479

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Tabular disclosure of the components of accrued liabilities.

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