Note 1 - Basis of Presentation and General Information (Details Textual)			1 Months Ended	6 Months Ended
	May 10, 2017 USD ($) t $ / item	Apr. 28, 2017 t $ / item	Oct. 31, 2014 g	Jun. 30, 2017 USD ($) g	Oct. 31, 2014 t
Vessels In Operation				46
Average Age in Years of Operating Fleet				7 years 255 days
Dead Weight Tonnage of Operating Fleet | g				2,600,542
Amount of Loss on Vessels on Held for Sale Combined with Loss on Sale of Vessels [Member] | Three Months Ended 2016 [Member]
Prior Period Reclassification Adjustment				$ 115,000
Amount of Loss on Vessels on Held for Sale Combined with Loss on Sale of Vessels [Member] | Six Months Ended 2016 [Member]
Prior Period Reclassification Adjustment				115,000
Amount of Loss on Sale of Vessels Combined with Loss on Vessels on Held for Sale [Member] | Three Months Ended 2016 [Member]
Prior Period Reclassification Adjustment				286,210
Amount of Loss on Sale of Vessels Combined with Loss on Vessels on Held for Sale [Member] | Six Months Ended 2016 [Member]
Prior Period Reclassification Adjustment				286,210
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
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] | Fifth Year Option [Member]
Vessel Hiring Rate | $ / item	13,800
2013 Built Japanese Vessel [Member] | Sixth Year Option [Member]
Vessel Hiring Rate | $ / item	14,300
Supramax Vessels [Member]
Vessels In Operation				38
Ultramax Vessels [Member]
Vessels In Operation				8