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Note 16 - Financial Instruments - Fair Value of Company's Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Vessel profit participation liability		$ 1,067,500
Vessels held for sale, impairment loss			$ 4,595,819
Fair Value, Nonrecurring [Member]
Vessel profit participation liability		1,067,500	1,297,100
Fair Value, Nonrecurring [Member] | Vessels [Member]
Vessels held for sale, fair value			5,000,000
Vessels held for sale, impairment loss			4,595,819
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Vessel profit participation liability
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Vessels [Member]
Vessels held for sale, fair value
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Vessel profit participation liability		1,067,500	1,297,100
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Vessels [Member]
Vessels held for sale, fair value			5,000,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Vessel profit participation liability
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Vessels [Member]
Vessels held for sale, fair value

X

- Definition

Carrying amount as of the balance sheet date of vessel profit participation liability, due after one year or the normal operating cycle, if longer.

+ References

No definition available.

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- 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
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- Definition

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-Publisher FASB
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-Section 50
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