Note 4 - Vessels (Details Textual)			3 Months Ended				6 Months Ended
	Mar. 15, 2017 USD ($)	Jan. 06, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) g	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) g	Jun. 30, 2016 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 14, 2016 USD ($) t
Number Of Vessels					46		46
Dead Weight Tonnage of Operating Fleet | g					2,600,542		2,600,542
Gain (Loss) on Disposition of Property Plant Equipment					$ 1,805,785	$ (401,210)	$ 1,897,899	$ (401,210)
Advances for Vessel Purchase, Noncurrent					$ 20,863,466		20,863,466			$ 1,926,886
Proceeds from Sale of Property, Plant, and Equipment							10,586,500	$ 5,767,000
SDARI-64 Ultramax Dry Bulk Vessel [Member]
Dead Weight Tonnage of Operating Fleet | t											64,000
Vessel, Purchase Price											$ 17,900,000
Vessel Redwing [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		$ 0.10
Proceeds from Sale of Property, Plant, and Equipment		$ 5,800,000
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		$ 20,800,000
Vessel Agreement, Remaining Number of Vessels to Be Delivered					3		3
Vessel Sparrow [Member]
Gain (Loss) on Disposition of Property Plant Equipment	$ 1,800,000
Proceeds from Sale of Property, Plant, and Equipment	$ 4,800,000
Vessel Woodstar [Member] | Scenario, Forecast [Member]
Gain (Loss) on Disposition of Property Plant Equipment				$ 200,000
Proceeds from Sale of Property, Plant, and Equipment				$ 7,800,000
Vessel Wren [Member] | Scenario, Forecast [Member]
Gain (Loss) on Disposition of Property Plant Equipment			$ 50,000
Proceeds from Sale of Property, Plant, and Equipment			$ 7,600,000