Note 2 - Assets Held for Sale - Assets Held for Sale (Details) $ in Thousands	Dec. 31, 2019 USD ($) a	Mar. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($) a
Kapalua Central Resort Project [Member] | Kapalua Resort [Member]
Assets held for sale	$ 2,938
Area of real estate (Acre) | a	46
Kapalua Water Company and Kapalua Waste Treatment Company [Member] | Kapalua Resort [Member]
Assets held for sale	$ 4,503		$ 7,696
630-Acre Parcel Of Agricultural Land [Member]
Area of real estate (Acre) | a	630		630
630-Acre Parcel Of Agricultural Land [Member] | Upcountry Maui [Member]
Assets held for sale	$ 156		$ 156
Agricultural Land and Wastewater Treatment Facility [Member] | Upcountry Maui [Member]
Assets held for sale		$ 0	$ 56
Area of real estate (Acre) | a		33	33