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Note 7 - Commitments and Contingencies - Summary of Concentration Risk by Segment (Details) - Geographic Concentration Risk [Member] - Total Revenue [Member] - New York City [Member] | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Concentration Risk | 100.00% | 100.00% | 100.00% | 100.00%
Commercial Segment [Member] |  |  |  |
Concentration Risk | 16.00% | 26.00% | 16.00% | 26.00%
Residential Segment [Member] |  |  |  |
Concentration Risk | 84.00% | 74.00% | 84.00% | 74.00%

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