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Note 16 - Revenues - Revenues (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 152,338,278	$ 136,539,399	$ 131,501,881
Time charter revenues – related party	1,973,643	7,592,784	9,814,000
Off-hire	(1,015,300)	(1,639,968)	(245,590)
Total	154,311,921	144,132,183	141,315,881
Time Charter [Member]
Revenues	97,195,215	83,211,819	68,834,267
Bareboat [Member]
Revenues	27,647,268	29,422,512	32,977,819
Voyage Charter [Member]
Revenues	26,924,708	23,210,618	26,421,003
Ballast Bonus [Member]
Revenues	160,000	50,000	300,000
Other Income Revenues [Member]
Revenues	$ 1,426,387	$ 2,284,418	$ 3,214,382

X

- Definition

Represents the amount of off-hire to offset revenue.

+ References

No definition available.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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