Note 1 - Description of Business and Significant Accounting Policies - Restatement of Previously Issued Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leasing	$ 8,461	$ 8,513
Total operating revenues	9,289	20,960	[1]
Leasing	4,420	3,598
General and administrative	3,998	2,795
Share-based compensation	2,846	1,278
Depreciation	869	1,109
Total operating costs and expenses	14,260	11,353
OPERATING LOSS	(4,971)	9,607
Gain from dercognition of nonfinancial asset	1,626	0
Other income	707	71
Pension and other post-retirement expenses	(436)	(7,885)
Interest expense	(6)	(6)
NET LOSS	(3,080)	1,787
Other comprehensive income - pension, net	1,370	7,381
TOTAL COMPREHENSIVE LOSS	$ (1,710)	$ 9,168
NET LOSS PER COMMON SHARE-BASIC AND DILUTED (in dollars per share)	$ (0.15)	$ 0.09
Land and Development Sales [Member]
Operating revenues	$ 0	$ 11,600
Operating Costs and Expenses	595	1,026
Resort Amenities and Other [Member]
Operating revenues	828	847
Operating Costs and Expenses	1,532	$ 1,547
Previously Reported [Member]
Leasing	8,461
Total operating revenues	10,915
Leasing	4,420
General and administrative	3,998
Share-based compensation	2,846
Depreciation	869
Total operating costs and expenses	14,260
OPERATING LOSS	(3,345)
Gain from dercognition of nonfinancial asset	0
Other income	707
Pension and other post-retirement expenses	(436)
Interest expense	(6)
NET LOSS	(3,080)
Other comprehensive income - pension, net	1,370
TOTAL COMPREHENSIVE LOSS	$ (1,710)
NET LOSS PER COMMON SHARE-BASIC AND DILUTED (in dollars per share)	$ (0.15)
Previously Reported [Member] | Land and Development Sales [Member]
Operating revenues	$ 1,626
Operating Costs and Expenses	595
Previously Reported [Member] | Resort Amenities and Other [Member]
Operating revenues	828
Operating Costs and Expenses	1,532
Revision of Prior Period, Error Correction, Adjustment [Member]
Leasing	0
Total operating revenues	(1,626)
Leasing	0
General and administrative	0
Share-based compensation	0
Depreciation	0
Total operating costs and expenses	0
OPERATING LOSS	(1,626)
Gain from dercognition of nonfinancial asset	1,626
Other income	0
Pension and other post-retirement expenses	0
Interest expense	0
NET LOSS	0
Other comprehensive income - pension, net	0
TOTAL COMPREHENSIVE LOSS	$ 0
NET LOSS PER COMMON SHARE-BASIC AND DILUTED (in dollars per share)	$ 0
Revision of Prior Period, Error Correction, Adjustment [Member] | Land and Development Sales [Member]
Operating revenues	$ (1,626)
Operating Costs and Expenses	0
Revision of Prior Period, Error Correction, Adjustment [Member] | Resort Amenities and Other [Member]
Operating revenues	0
Operating Costs and Expenses	$ 0

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