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Note 8 - Commitments and Contingencies - Summary of Concentration Risk by Segment (Details) - Total Revenue [Member] - Geographic Concentration Risk [Member] - New York City [Member]	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Three months ended March 31, 2022	100.00%	100.00%
Commercial Segment [Member]
Three months ended March 31, 2022	33.00%	30.00%
Residential Segment [Member]
Three months ended March 31, 2022	67.00%	70.00%

X

- 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
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-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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