Note 11 - Financial Instruments (Details Textual)	6 Months Ended	9 Months Ended
Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Long-term Debt, Fair Value		$ 71,360,000
Difference Between Fair Value and Carrying Value		230,000
Long-term Debt, Total		71,130,000
M/V EM Oinousses [Member]
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	$ 3,770,000	3,800,000
Property, Plant, and Equipment, Fair Value Disclosure	3,870,000	3,700,000
Vessel Held for Sale, Estimated Sale Costs	220,000
Impairment of Long-Lived Assets to be Disposed of	$ 120,000	$ 100,000
Interest Rate Swap [Member]
Derivative, Number of Instruments Held, Total		1
Derivative, Notional Amount		$ 30,000,000

Represents the difference between fair value and carrying value.

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- Definition

The estimated sale costs of vessel held for sale.

+ References

No definition available.

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- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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- Definition

The number of derivative instruments of a particular group held by the entity.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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