Note 16 - Reportable Operating Segments - Reportable Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024		Sep. 30, 2025	Sep. 30, 2024		Dec. 31, 2024
Revenues		$ 4,525	$ 3,028		$ 14,932	$ 8,153
Depreciation expense		(290)	(187)		(831)	(531)
Operating income (loss)		(360)	(2,232)		(2,849)	(5,516)
Gain on asset disposal					1	0
Other income		71	75		525	271
Assets (3)		45,839			45,839			$ 50,139
Operating Segments [Member]
Revenues	[1]				14,932	8,153
Operating costs and expenses					(10,221)	(5,126)
Depreciation expense					(831)	(531)
General and administrative expenses					(6,729)	(8,012)
Operating income (loss)					(2,849)	(5,516)
Pension and other post-retirement expenses					(6,914)	(234)
Interest expense					(162)	(5)
Gain on asset disposal					1
Other income					525	271
Loss from continuing operations					(9,399)	(5,484)
Capital expenditures	[2]				3,625	2,635
Assets (3)	[3]	45,839	41,936		45,839	41,936
Operating Segments [Member] | Land Development and Sales Segment [Member]
Revenues	[1]				4,211	200
Operating costs and expenses					(3,705)	(687)
Depreciation expense					(6)	0
General and administrative expenses					(548)	(500)
Operating income (loss)					(48)	(987)
Capital expenditures	[2]				2,844	1,103
Assets (3)	[3]	18,307	16,042	[4]	18,307	16,042	[4]
Operating Segments [Member] | Leasing Segment [Member]
Revenues					9,947	7,148
Operating costs and expenses					(5,450)	(3,447)
Depreciation expense					(542)	(502)
General and administrative expenses					(731)	(667)
Operating income (loss)					3,224	2,532
Capital expenditures					670	1,532
Assets (3)		17,514	15,418	[4]	17,514	15,418	[4]
Operating Segments [Member] | Resort Amenities Segment [Member]
Revenues	[1]				774	805
Operating costs and expenses					(1,066)	(992)
Depreciation expense					(8)	0
General and administrative expenses					(183)	(167)
Operating income (loss)					(483)	(354)
Capital expenditures	[2]				0	0
Assets (3)	[3]	1,316	1,219		1,316	1,219
Operating Segments [Member] | Corporate Segment and Other Operating Segment [Member]
Revenues	[1]				0	0
Operating costs and expenses					0	0
Depreciation expense					(275)	(29)
General and administrative expenses					(5,267)	(6,678)
Operating income (loss)					(5,542)	(6,707)
Capital expenditures	[2]				111	0
Assets (3)	[3]	$ 8,702	$ 9,257		$ 8,702	$ 9,257

[1] Amounts are principally revenues from external customers and exclude equity in earnings of affiliates.

[2] Includes expenditures for property and deferred costs.

[3] Segment assets are located in the United States.

[4] The land development and sales segment includes a $1.6 million equity method investment as of September 30, 2024.