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Consolidated Statements of Comprehensive Income/(Loss) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income/(loss) $ (1,218,237) $ (7,798,300) $ 2,566,678
Other comprehensive (loss)/income      
Effective portion of changes in fair value of interest swap contracts 592,460 418,723 (100,268)
Total other comprehensive (loss)/income 592,460 418,723 (100,268)
Total comprehensive income/(loss) $ (625,777) $ (7,379,577) $ 2,466,410