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Note 3 - Vessels, Net (Details Textual) - USD ($)		6 Months Ended
	Jun. 25, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 6,255,735	$ 5,137,010
Gain (Loss) on Disposition of Property Plant Equipment, Total		1,340,952	$ 516,561
Assets Held-for-sale, Not Part of Disposal Group, Current, Total				$ 4,914,782
M/V Monika P. [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 6,260,000
Sales Commission Percentage	3.00%
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 1,340,000
Assets Held-for-sale, Not Part of Disposal Group, Current, Total				$ 4,900,000
M/V Monika P. [Member] | Eurochart [Member]
Sales Commission Percentage	1.00%

X

- Definition

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

+ References

No definition available.

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- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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