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Note 5 - Lease Intangibles 1 (Details Textual) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Gross, Total	$ 5,321,296	$ 7,631,488		$ 9,026,435
Finite-Lived Intangible Assets, Accumulated Amortization	4,434,064	5,526,477		6,164,961
Below Market Lease, Net, Ending Balance	$ 226,346	$ 309,932	$ 310,000	495,927
Weighted Average [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	1 year 255 days	2 years 219 days
Real Estate Assets Held for Sale [Member]
Finite-Lived Intangible Assets, Gross, Total	$ 0	$ 2,300,000	2,300,000	2,500,000
Finite-Lived Intangible Assets, Accumulated Amortization		$ 1,400,000	$ 1,400,000	$ 1,500,000

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- Definition

Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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