Note 7 - Commitments and Contingencies (Details Textual)			1 Months Ended	3 Months Ended
	May 10, 2017 USD ($) t $ / item	Apr. 28, 2017 t $ / item	Oct. 31, 2014 g $ / d	Jun. 30, 2017 USD ($) g	Feb. 28, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2014 t
Dead Weight Tonnage of Operating Fleet | g				2,600,542
Advances for Vessel Purchase, Noncurrent				$ 20,863,466		$ 1,926,886
Japanese Vessel [Member]
Vessel Agreement, Termination Fee	$ 1,500,000			$ 1,500,000
Dead Weight Tonnage of Operating Fleet			37,000				37,000
Charters Agreement Term			7 years
Charters Agreement Term, Extension Option			1 year
Japanese Vessel [Member] | First Seven Years [Member]
Vessel Hiring Rate | $ / d			13,500
Japanese Vessel [Member] | Eighth Year Option [Member]
Vessel Hiring Rate | $ / d			13,750
2013 Built Japanese Vessel [Member]
Dead Weight Tonnage of Operating Fleet | t	61,400	61,400
Charters Agreement Term	4 years	4 years
Charters Agreement Term, Extension Option	2 years	2 years
Vessel Hiring Rate | $ / item	12,800	12,800
2013 Built Japanese Vessel [Member] | First Optional Year [Member]
Vessel Hiring Rate | $ / item		13,800
2013 Built Japanese Vessel [Member] | Second Optional Year [Member]
Vessel Hiring Rate | $ / item		14,300
Greenship Vessels [Member] | Eagle Bulk Ultraco LLC [Member]
Vessel Agreement, Number of Vessels to be Purchased					9
Vessel Agreement, Aggregate Purchase Price					$ 153,000,000
Vessel Agreement, Purchase Price of Each Vessel					$ 17,000,000
Vessel Agreement, Number of Vessels Delivered				6
Advances for Vessel Purchase, Noncurrent				$ 20,800,000
Vessel Agreement, Remaining Number of Vessels to Be Delivered				3