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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]
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Concentration Risk 100.00% 100.00%
Commercial Segment [Member]    
Concentration Risk 28.00% 30.00%
Residential Segment [Member]    
Concentration Risk 72.00% 70.00%