Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Segment Revenues
Operating revenues	$ 2,843	$ 2,542
Operating Segment Income (Loss)
Operating income (loss)	(795)	(825)
Operating Segments [Member]
Operating Segment Revenues
Operating revenues	2,843	2,542
Operating Segment Income (Loss)
Operating income (loss)	1,099	1,024
Operating Segments [Member] | Real Estate Segment [Member]
Operating Segment Revenues
Operating revenues	157	36
Operating Segment Income (Loss)
Operating income (loss)	(107)	(30)
Operating Segments [Member] | Leasing Segment [Member]
Operating Segment Revenues
Operating revenues	1,677	1,495
Operating Segment Income (Loss)
Operating income (loss)	1,109	917
Operating Segments [Member] | Utilities Segment [Member]
Operating Segment Revenues
Operating revenues	748	704
Operating Segment Income (Loss)
Operating income (loss)	147	183
Operating Segments [Member] | Resort Amenities Segment [Member]
Operating Segment Revenues
Operating revenues	261	307
Operating Segment Income (Loss)
Operating income (loss)	$ (50)	$ (46)