Note 10 - Derivative Instruments and Fair Value Measurements (Details Textual)	3 Months Ended			12 Months Ended
	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2014 USD ($)
Impairment of Long-Lived Assets Held-for-use	$ 122,860,600	$ 6,167,262	$ 50,872,734
Vessels and Vessel Improvements, Net	$ 234,860,600			$ 234,860,600		$ 234,860,600	$ 76,332,734
Number of Vessels Sold	4	4		4
Number of Vessels, Held-for-sale	2	2		2
Vessels and Vessel Improvements [Member]
Impairment of Long-Lived Assets Held-for-use	$ 122,860,600	$ 6,167,262		$ 122,860,600	$ 50,872,734