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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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Area of a real estate property.

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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.

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