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Note 9 - Deferred Income
12 Months Ended
Dec. 31, 2015
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue Disclosure [Text Block]
9. Deferred Income

The amounts shown in the accompanying consolidated balance sheets amounting to $7,064,756 and $5,423,533 represent time and bareboat charter revenues received in advance as of December 31, 2014 and as of December 31, 2015, respectively.