Note 1 - Description of Business and Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2024 USD ($) a ft² $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Jul. 01, 2024 USD ($)	Jun. 18, 2022 $ / shares shares	Apr. 30, 2019 USD ($)
Capital Units, Authorized (in shares) | shares				48,000,000
Common Stock, Shares Authorized (in shares) | shares	43,000,000	43,000,000		43,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001		$ 0.0001
Preferred Stock, Shares Authorized (in shares) | shares	5,000,000	5,000,000		5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001		$ 0.0001
Asset Impairment Charges	$ 0	$ 0
Impairment of Deferred Development Costs	0	0
Impairment, Long-Lived Asset, Held-for-Use	$ 0	$ 0
Government Assistance, Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration]	Operating Lease, Lease Income	Operating Lease, Lease Income
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares	19,600,000	19,600,000
Subsidized Stewardship and Conservation Efforts [Member]
Area of Land (Acre) | a	9,000
Government Assistance, Award Amount	$ 60,000		$ 340,000		$ 1,100,000
Government Assistance, Income, Increase (Decrease)	$ 300,000	$ 300,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years
HAWAII
Area of Land (Acre) | a	22,300
Area of Real Estate Property (Square Foot) | ft²	247,000