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Note 3 - Vessels (Details Textual)
3 Months Ended 4 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Apr. 26, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Apr. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Vessels and Vessel Improvements [Member]              
Impairment of Long-Lived Assets Held-for-use       $ 6,167,262     $ 50,872,734
Vessel Peregrine [Member] | Subsequent Event [Member]              
Property, Plant and Equipment, Disposals   $ 2,700,000          
Vessel Peregrine [Member] | Scenario, Forecast [Member]              
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property     $ (150,000)        
Harrier and Falcon [Member] | Subsequent Event [Member] | First Lien Facility [Member]              
Debt Obligations, Sales Proceeds, Percentage 50.00%            
Harrier and Falcon [Member] | Subsequent Event [Member]              
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ (100,000)            
Number of Vessels Sold 2         2  
Vessel Falcon [Member] | Subsequent Event [Member]              
Proceeds from Sale of Property, Plant, and Equipment           $ 3,300,000  
Vessel Harrier [Member] | Subsequent Event [Member]              
Proceeds from Sale of Property, Plant, and Equipment           $ 3,300,000  
Number Of Vessels       44      
Impairment of Long-Lived Assets Held-for-use       $ 6,167,262