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Note 11 - Financial Instruments - Fair Value of Company's Investments (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Vessels held for sale, impairment loss	$ 121,165
Fair Value, Nonrecurring [Member] | Vessels [Member]
Vessel held for sale	3,873,406
Vessels held for sale, impairment loss	121,165
Fair Value, Nonrecurring [Member] | Vessels [Member] | Fair Value, Inputs, Level 1 [Member]
Vessel held for sale
Fair Value, Nonrecurring [Member] | Vessels [Member] | Fair Value, Inputs, Level 2 [Member]
Vessel held for sale	3,873,406
Fair Value, Nonrecurring [Member] | Vessels [Member] | Fair Value, Inputs, Level 3 [Member]
Vessel held for sale

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Section 45
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X

- Definition

Fair value portion of assets classified as held for sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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