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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Nov. 07, 2019	Dec. 31, 2018
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.03	$ 0.03	$ 1	$ 0.03
Future Gross Minimum Revenues Under Non-cancellable Time Charter Agreements		$ 17,200,000
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

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- Definition

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

+ References

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- Definition

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- Definition

Face amount or stated value per share of common stock.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ 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

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