Note 9 - Discontinued Operations (Details Textual) $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($) a
Payments to Acquire Property, Plant, and Equipment, Total	[2]	$ 517	[1]	$ 990
Kapalua Mauka [Member]
Area of Real Estate Property (Acre) | a				125
Discontinued Operations, Disposed of by Sale [Member] | PUC-regulated Assets [Member] | Kapalua Water Company and Kapalua Waste Treatment Company [Member] | Kapalua Resort [Member]
Disposal Group, Including Discontinued Operation, Consideration				$ 4,300
Asset Purchase Agreement, Deliver Water Agreement, Initial Term (Year)				20 years
Disposal Group Including Discontinued Operation, Excluded From Purchase Price				$ 3,600
Discontinued Operations [Member]
Payments to Acquire Property, Plant, and Equipment, Total		$ 0		$ 600

[1] Includes assets related to discontinued operations of $4.7 million and $5.2 million at December 31, 2020 and 2019, respectively.

[2] Includes expenditures for property and deferred costs.