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Note 9 - Commitments and Contingencies - Summary of Concentration Risk by Segment (Details) - Total Revenue [Member] - Geographic Concentration Risk [Member] - New York City [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Concentration risk	100.00%	100.00%	100.00%	100.00%
Commercial Segment [Member]
Concentration risk	26.00%	26.00%	25.00%	27.00%
Residential Segment [Member]
Concentration risk	74.00%	74.00%	75.00%	73.00%

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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