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Note 12 - Subsequent Events (Details Textual)					1 Months Ended		6 Months Ended
	Aug. 08, 2019 USD ($)	Aug. 08, 2019 USD ($)	Aug. 05, 2019 USD ($)	Jul. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Aug. 31, 2019 USD ($) Rate shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total								$ 1,867
Proceeds from Issuance of Long-term Debt, Total							$ 12,000,000	$ 4,250,000
Subsequent Event [Member]
Proceeds from Issuance of Long-term Debt, Total					$ 16,167,680,000,000
Subsequent Event [Member] | Piraeus Bank S.A. [Member]
Proceeds from Issuance of Long-term Debt, Total				$ 3,667,680
Debt Instrument, Periodic Payment, Total				160,460
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid				$ 1,742,160
Subsequent Event [Member] | Piraeus Bank S.A. [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate				3.50%
Subsequent Event [Member] | HSBC Bank PLC [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 12,500,000	$ 9,000,000	$ 3,500,000
Debt Instrument, Periodic Payment, Total	450,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 6,200,000	$ 6,200,000
Subsequent Event [Member] | HSBC Bank PLC [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.95%
Subsequent Event [Member] | Four Feeder Containerships [Member]
Number of Vessels Acquired						4
Payments to Acquire Property, Plant, and Equipment, Total						$ 15,000,000
Stock Issued During Period, Shares, Purchase of Assets | shares						22,535,210
Shares Issued, Percent of Outsanding Shares of the Company | Rate						6430.00%

X

- Definition

The number of vessels acquired during the period.

+ References

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- Definition

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+ References

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- Definition

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- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
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- Definition

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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- Definition

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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