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Note 5 - Rental Income Under Operating Leases (Details Textual) - ft² | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
141 Livingston Street, Brooklyn [Member] |  |  |  |
Area of Real Estate Property | 206,084 |  | 206,084 |
Total Revenue [Member] | Customer Concentration Risk [Member] | City of New York [Member] |  |  |  |
Concentration Risk, Percentage | 11.00% | 21.00% | 11.00% | 21.00%

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