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Note 4 - Related Party Transactions (Details Textual)		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 EUR (€)	Aug. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Service Management Costs Daily Fee Related Party | €			€ 685		€ 685
Related Party Agreement Term	5 years
Related Party Transaction Discount Percentage	5.00%
Due to Related Parties, Total		$ 441,754					$ 2,672,895
Eurobulk Ltd. [Member] | Fixed Management Fees [Member]
Related Party Transaction, Amounts of Transaction		625,000		$ 936,126
Eurobulk Ltd. [Member] | Vessel Management Fees [Member]
Related Party Transaction, Amounts of Transaction		$ 1,547,139		1,861,009
Colby Trading Ltd [Member]
Financing Commitment to Fund Working Capital Requirement, Maximum Amount								$ 2,000,000	$ 4,000,000
Colby Trading Ltd [Member] | Subsequent Event [Member]
Financing Commitment to Fund Working Capital Requirement, Maximum Amount						$ 4,000,000
Eurochart [Member] | Vessel Sales [Member]
Related Party Transaction Commission, Percentage		1.00%	1.00%
Related Party Transaction, Expenses from Transactions with Related Party				64,500
Eurochart [Member] | Charter Revenues [Member]
Related Party Transaction Commission, Percentage		1.25%	1.25%
Related Party Transaction, Expenses from Transactions with Related Party		$ 214,621		238,016
Sentinel [Member]
Related Party Transaction, Expenses from Transactions with Related Party		$ 21,258		24,039
Related Party Transaction Commission on Premium, Maximum, Percentage		5.00%	5.00%
Technomar [Member]
Related Party Transaction, Expenses from Transactions with Related Party		$ 64,995		$ 71,341
Related Party Transaction Amounts of Transaction Per Crew Member Per Month		$ 50

X

- Definition

The maximum amount financing commitment to fund the company's working capital requirements.

+ References

No definition available.

+ Details

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X

- Definition

Represents the term of a related party agreement.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

The percentage of the related party transaction commission.

+ References

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- Definition

Related party transaction discount percentage.

+ References

No definition available.

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X

- Definition

The aggregate costs related to vessel management fees.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

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

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- Definition

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

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