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Note 5 - Advances for Vessels Under Contruction and Acquisition - Summary of Advances for Vessels Under Construction and Acquisitions (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance $ 44,031,882 $ 88,965,085  
Advances for vessels under construction and acquisitions 51,949,154 148,318,231  
Interest Costs Capitalized 1,660,802 1,822,443 $ 2,113,297
Capitalized expenses 2,576,626 5,085,534  
Vessels delivered (44,432,663) (200,159,411)  
Balance $ 55,785,801 $ 44,031,882 $ 88,965,085