Note 5 - Assets Held for Sale and Real Estate Operating Revenues - Assets Held for Sale (Details) (Parentheticals) - a	Jun. 30, 2018	Dec. 31, 2017
630-Acre Parcel Of Agricultural Land [Member]
Area of real estate (Acre)	630	630
Agricultural Land and Wastewater Treatment Facility [Member] | Upcountry Maui [Member]
Area of real estate (Acre)	80	80