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Note 9 - Deferred Income (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Note 9 - Deferred Income (Details) [Line Items]    
Deferred Revenue, Current $ 4,954,193 $ 6,711,945
Time and Bareboat Deferred Revenue [Member]    
Note 9 - Deferred Income (Details) [Line Items]    
Deferred Revenue, Current $ 5,423,533 $ 7,064,756