Note 8 - Investments in and Advances to Unconsolidated Real Estate Joint Ventures - Summary of Financial Information in Altis Grand Central (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 127,581	$ 118,045	$ 90,037
Real estate ($4,443 in 2022 and $7,679 in 2021 held for sale)	12,345	22,868
Other assets	21,453	15,783
Total assets	562,841	533,355	447,656
Other liabilities	5,922	5,002
Total liabilities	223,899	209,263
Total equity	334,528	322,948	309,253	$ 182,236
Total liabilities and equity	562,841	533,355
Total revenues	342,045	313,597	173,229
Net income (loss)	27,642	47,066	(47,090)
Equity in net earnings of unconsolidated real estate joint ventures	38,414	18,154	465
Altis Grand Central [Member]
Equity in net earnings of unconsolidated real estate joint ventures	0	6,182	(406)
Altis Grand Central [Member]
Cash and cash equivalents	0	0
Real estate ($4,443 in 2022 and $7,679 in 2021 held for sale)	0	0
Investment in unconsolidated subsidiaries	4,589	4,879
Other assets	0	0
Total assets	4,589	4,879
Notes payable	0	0
Other liabilities	0	0
Total liabilities	0	0
Total equity	4,589	4,879
Total liabilities and equity	4,589	4,879
Total revenues	0	5,735	2,630
Gain on sale of equity interest in joint venture	0	53,537	0
Total expenses	0	(7,180)	(6,294)
Net income (loss)	$ 0	$ 52,092	$ (3,664)