Note 7 - Mortgage and Other Indebtedness - Lamont Street Preferred Interest (Details Textual) - USD ($) $ in Millions					12 Months Ended
	Jun. 30, 2023	May 05, 2023	Jun. 04, 2021	May 21, 2021	Dec. 31, 2023
Lamont Street Preferred Interest [Member]
Debt Instrument [Line Items]
Description on extended redemption date					September 30, 2024 and September 30, 2025
Payment fee percentage, first extension option					0.25%
Payment fee percentage, second extension option					0.50%
Preferred Investor payments, description					Additionally, at the Lamont Street Redemption Date, Lamont Street was entitled to (i) a redemption fee of 0.50% of the capital contributions returned and (ii) an amount equal to (a) the product of (i) the aggregate amount of capital contributions made and (ii) 0.26 less (b) the aggregate amount of Lamont Street Class A Return payments made to Lamont Street (the “Lamont Street Minimum Multiple Amount”)
Percentage of redemption fee of capital contribution returned					0.50%
Repayments of secured debt	$ 2.3
Lamont Street Preferred Interest [Member] | Class A Units [Member]
Debt Instrument [Line Items]
Annual return percentage on initial capital contribution					13.50%
Cumulative annual return percentage, paid current					10.00%
Cumulative annual return percentage, accrued					3.50%
Lamont Street Preferred Interest [Member] | Spotswood [Member] | Class A Units [Member]
Debt Instrument [Line Items]
Preferred investor, capital contribution			$ 3.9
Interest percentage in exchange of capital contribution			1.00%
Lamont Street Preferred Interest [Member] | Highlandtown [Member] | Class A Units [Member]
Debt Instrument [Line Items]
Preferred investor, capital contribution				$ 3.9
Interest percentage in exchange of capital contribution				1.00%
Highlandtown Mortgage [Member]
Debt Instrument [Line Items]
Repayments of secured debt		$ 1.9