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Note 11 - Concentration of Credit Risk (Details Textual) | 12 Months Ended
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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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