Note 6 - Mortgage and Other Indebtedness - Schedule of Minimum Debt Service Coverage (Parenthetical) (Detail) - Cromwell Field Shopping Center [Member]		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Minimum debt service coverage ratio	[1]				1.20
Forecast [Member]
Debt Instrument [Line Items]
Minimum debt service coverage ratio		1.35	1.55	1.20

[1] The debt service coverage ratio testing will commence December 31, 2023 with the following requirements: (i) 1.20 to 1.00 as of December 31, 2023; (ii) 1.55 to 1.00 as of December 31, 2024 and (iii) 1.35 to 1.00 as of December 31, 2025 and for the remaining term of the loan.