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Note 6 - Vessels, Net - Summary of Vessels, Net (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Vessel Cost, Balance $ 1,066,630,849 $ 895,387,989  
Accumulated Amortization, Balance (201,940,961) (184,035,144)  
Net Book Value, Balance 864,689,888 711,352,845  
Vessel Cost, Acquisitions 44,432,663 200,159,411  
Vessel Cost, Disposals (591,137) (1,977,051)  
Accumulated Amortization, Disposals    
Net Book Value, Disposals (591,137) (1,977,051)  
Vessel Cost, Impairment loss (34,859,054) (26,190,677)  
Accumulated Amortization, Impairment loss 29,123,968 17,951,690  
Net Book Value, Impairment loss (5,735,086) (8,238,987) $ (6,168,747)
Vessel Cost, Vessel Held For Sale   (748,823)  
Accumulated Amortization, Depreciation (39,096,589) (35,857,507) (33,811,607)
Net Book Value, Depreciation (39,096,589) (35,857,507)  
Vessel Cost, Balance 1,075,613,321 1,066,630,849 895,387,989
Accumulated Amortization, Balance (211,913,582) (201,940,961) (184,035,144)
Net Book Value, Balance $ 863,699,739 $ 864,689,888 $ 711,352,845