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Note 4 - Vessels, Net (Details Textual) - USD ($)				6 Months Ended
	Jun. 19, 2017	Jan. 31, 2017	Jan. 10, 2017	Jun. 30, 2017	Jun. 30, 2016
Gain (Loss) on Disposition of Property Plant Equipment				$ 516,561	$ 10,597
Payments to Acquire Property, Plant, and Equipment				11,518,463	23,080,296
Vessels Delivered During the Period				4,473,448
Proceeds from Sale of Property, Plant, and Equipment				5,137,010	$ 4,196,268
M/V Tasos [Member]
Payments to Acquire Property, Plant, and Equipment			$ 4,500,000
Vessels Delivered During the Period			$ 4,500,000
M/V Tasos [Member] | Eurochart [Member] | Commission Paid on Sale of Vessel [Member]
Related Party Transaction, Expenses from Transactions with Related Party				$ 44,000
M/V RT Dagr [Member]
Sales Commission Percentage		4.00%
Gain (Loss) on Disposition of Property Plant Equipment		$ 516,651
Proceeds from Sale of Property, Plant, and Equipment		$ 2,440,000
M/V RT Dagr [Member] | Eurochart [Member]
Sales Commission Percentage		1.00%
M/V EM Astoria [Member]
Payments to Acquire Property, Plant, and Equipment	$ 4,750,000
M/V EM Astoria [Member] | Euromar LLC [Member]
Payments to Acquire Property, Plant, and Equipment	4,750,000
M/V EM Astoria [Member] | Eurochart [Member] | Commission Paid on Sale of Vessel [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 0

X

- Definition

Represents sales commissions percentage on sale of property plant and equipment assets.

+ References

No definition available.

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- Definition

The monetary amount related to vessels that have been delivered during the period.

+ References

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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