Note 3 - Real Estate - Summary of Geographic Concentration of Properties (Parenthetical) (Details) - Geographic Concentration Risk [Member] - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022
Spotswood Valley Square Shopping Center [Member]
Concentration Risk [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,200	$ 1,700
Rental Income [Member]
Concentration Risk [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 29,671	$ 21,034

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details