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Note 11 - Concentration of Credit Risk (Details Textual)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Rental Income [Member]
Number of Major Customers		3
Customer Concentration Risk [Member] | Rental Income [Member] | Customer 1 [Member]
Concentration Risk, Percentage		24.00%
Customer Concentration Risk [Member] | Rental Income [Member] | Customer 2 [Member]
Concentration Risk, Percentage		21.00%
Customer Concentration Risk [Member] | Rental Income [Member] | Customer 3 [Member]
Concentration Risk, Percentage		9.00%
Customer Concentration Risk [Member] | Rental Income [Member] | Small Businesses and Not-for-Profit Corporations [Member] | Forecast [Member]
Concentration Risk, Percentage	37.00%

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- Definition

Number of major customers

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 825
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-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

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-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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