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Note 7 - Other Operating (Income) / Expenses (Details Textual) - USD ($)		1 Months Ended	6 Months Ended
	Feb. 29, 2020	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2017
Other Operating Expenses, Income			$ (350,000)	$ 1,296,496
Other Operating Expenses, Income from Collection of Previously Written off Accounts				200,000
Other Operating Expense (Income) From Settlement of Acccounts With Charterers			$ 350,000
M/V Manolis P [Member]
Advance Received for Vessel Held for Sale	$ 1,133,817
Other Operating Expenses, Income				1,000,000.0
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Settled Litigation [Member] | Alterwall Business Inc. [Member]
Restricted Cash and Investments, Total		$ 530,000		530,000
Increase (Decrease) in Restricted Investments for Operating Activities, Total				(530,000)
Estimated Litigation Liability		150,000		150,000
Payments for Legal Settlements		60,000.00
Litigation Settlement, Expense		$ 10,000.00
Gain (Loss) Related to Litigation Settlement				$ 80,000.00
Alterwall Business Inc. Vs. Fuel Oil Supplier [Member] | Pending Litigation [Member] | Alterwall Business Inc. [Member]
Estimated Litigation Liability					$ 150,000

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+ References

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580

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-URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581

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