Note 2 - Assets Held for Sale (Details Textual) $ in Thousands	Sep. 14, 2020 USD ($)	Dec. 31, 2019 USD ($) a	Mar. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($) a
Kapalua Central Resort Project [Member] | Kapalua Resort [Member]
Area of Real Estate Property | a		46
Real Estate Held-for-sale		$ 2,938
Kapalua Central Resort Project [Member] | Forecast [Member]
Receivables, Long-term Contracts or Programs, Total	$ 43,900
Kapalua Water Company and Kapalua Waste Treatment Company [Member] | Kapalua Resort [Member]
Receivables, Long-term Contracts or Programs, Total		3,800
Real Estate Held-for-sale		4,503		$ 7,696
Agricultural Land and Wastewater Treatment Facility [Member] | Upcountry Maui [Member]
Area of Real Estate Property | a			33	33
Real Estate Held-for-sale			$ 0	$ 56