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Note 5 - Related Party Transactions (Details Textual)	3 Months Ended			12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)
Revenue from Related Parties	$ 60,000		$ 60,000
Due to Related Parties	7,316				$ 11,539
Related Party Transaction Amounts of Transaction Per Crew Member Per Month	50
Eurobulk Ltd. [Member] | Fixed Management Fees [Member]
Related Party Transaction, Amounts of Transaction	500,000		500,000
Eurobulk Ltd. [Member] | Vessel Management Fees (Member)
Related Party Transaction Daily Fee Per Vessel Per Day in Operation | €		€ 685
Related Party Transaction, Amounts of Transaction	859,594		794,196
Sentinel [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 35,101		26,174
Related Party Transaction Commission on Premium, Maximum, Percentage	5.00%	5.00%
Technomar [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 33,038		31,665
Vessel Management Fees (Member) | Eurobulk Ltd. [Member]
Service Management Costs Daily Fee Related Party | €				€ 685
Vessel Sales [Member] | Eurochart [Member]
Related Party Transaction Commission, Percentage	1.00%	1.00%
Vessel Sales [Member] | Eurochart [Member] | MV RT Dagr and M/V Eleni P [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 53,871
Vessel Sales [Member] | Eurochart [Member] | M/V Aristides [Member]
Related Party Transaction, Expenses from Transactions with Related Party			28,055
Charter Revenues [Member] | Eurochart [Member]
Related Party Transaction Commission, Percentage	1.25%	1.25%
Related Party Transaction, Expenses from Transactions with Related Party	$ 109,186		85,701
Vessel Acquisition [Member] | Eurochart [Member] | M/V Tasos [Member]
Related Party Transaction, Expenses from Transactions with Related Party	44,000
Vessel Acquisition [Member] | Eurochart [Member] | MV Alexandros P [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 90,000
Vessel Acquisition [Member] | Eurochart [Member] | M/V Xenia [Member]
Related Party Transaction, Expenses from Transactions with Related Party			$ 213,500

X

- Definition

Represents the related party transaction amounts of transaction per crew member per month.

+ References

No definition available.

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- Definition

Represents the the maximum percentage of commission on premium to be paid to a related party.

+ References

No definition available.

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- Definition

The percentage of the related party transaction commission.

+ References

No definition available.

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- Definition

Related Party Transaction Daily Fee Per Vessel Per Day In Operation

+ References

No definition available.

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- Definition

The aggregate costs related to vessel management fees.

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(3),(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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- Definition

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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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 1
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