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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)	Sep. 30, 2020	Nov. 07, 2019
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements	$ 17,000,000
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements, Due in Next Twelve Months	16,500,000
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements, Due in Next Two Years	500,000
Purchase of Vessels [Member]
Cash Issued Per Vessel Purchased		$ 500,000
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Pending Litigation [Member] | Alterwall Business Inc. [Member]
Restricted Cash and Investments, Total	530,000
Estimated Litigation Liability	$ 150,000

X

- Definition

The amount of cash issued per vessel purchased in an agreement.

+ References

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- Definition

The amount of future gross minimum revenues under non-cancellable time charter agreements.

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- Definition

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+ References

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- Definition

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- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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