Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Segment Revenues
Operating revenues	$ 9,683	$ 2,976
Operating Segment Income (Loss)
Operating income (loss)	5,926	(777)
Operating Segments [Member]
Operating Segment Revenues
Operating revenues	9,683	2,976
Operating Segment Income (Loss)
Operating income (loss)	7,592	1,136
Operating Segments [Member] | Real Estate Segment [Member]
Operating Segment Revenues
Operating revenues	7,139	168
Operating Segment Income (Loss)
Operating income (loss)	6,403	(132)
Operating Segments [Member] | Leasing Segment [Member]
Operating Segment Revenues
Operating revenues	1,586	1,615
Operating Segment Income (Loss)
Operating income (loss)	1,117	903
Operating Segments [Member] | Utilities Segment [Member]
Operating Segment Revenues
Operating revenues	676	847
Operating Segment Income (Loss)
Operating income (loss)	123	216
Operating Segments [Member] | Resort Amenities Segment [Member]
Operating Segment Revenues
Operating revenues	282	346
Operating Segment Income (Loss)
Operating income (loss)	$ (51)	$ 149