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Note 17 - Commitments and Contingencies (Detail) (USD $)	15 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Vessels Under Construction						4
Purchase Commitment, Remaining Minimum Amount Committed						$ 76,800,000
Contractual Charter Revenue	$ 2,231,500	$ 10,810,030	$ 25,010,586	$ 49,324,023	$ 73,836,235

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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