Note 13 - Concentrations of Credit Risks - Summary of Geographic Concentration of Properties (Parenthetical) (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)
Geographic Concentration Risk [Member] \| Spotswood Valley Square Shopping Center
Concentration Risk [Line Items]
Revenues	$ 1.2

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