Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Segment Income (Loss)
Operating income (loss)	$ 299	$ (1,488)	$ (356)	$ (2,744)
Operating Segments [Member]
Operating Segment Revenues
Operating revenues	3,437	2,810	9,385	8,312
Operating Segment Income (Loss)
Operating income (loss)	1,556	57	4,086	2,141
Operating Segments [Member] | Real Estate Segment [Member]
Operating Segment Revenues
Operating revenues	305	66	671	402
Operating Segment Income (Loss)
Operating income (loss)	(47)	(1,245)	(202)	(1,418)
Operating Segments [Member] | Leasing Segment [Member]
Operating Segment Revenues
Operating revenues	1,830	1,552	5,226	4,605
Operating Segment Income (Loss)
Operating income (loss)	1,246	932	3,464	2,701
Operating Segments [Member] | Utilities Segment [Member]
Operating Segment Revenues
Operating revenues	1,060	900	2,737	2,414
Operating Segment Income (Loss)
Operating income (loss)	334	307	824	780
Operating Segments [Member] | Resort Amenities Segment [Member]
Operating Segment Revenues
Operating revenues	242	292	751	891
Operating Segment Income (Loss)
Operating income (loss)	$ 23	$ 63		$ 78