Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Segment Income (Loss)
Operating income (loss)	$ 138	$ (431)	$ (656)	$ (1,256)
Operating Segments [Member]
Operating Segment Revenues
Operating revenues	3,105	2,960	5,948	5,502
Operating Segment Income (Loss)
Operating income (loss)	1,453	1,060	2,529	2,084
Operating Segments [Member] | Real Estate Segment [Member]
Operating Segment Revenues
Operating revenues	209	300	366	336
Operating Segment Income (Loss)
Operating income (loss)	(46)	(143)	(155)	(173)
Operating Segments [Member] | Leasing Segment [Member]
Operating Segment Revenues
Operating revenues	1,719	1,558	3,396	3,053
Operating Segment Income (Loss)
Operating income (loss)	1,116	852	2,218	1,769
Operating Segments [Member] | Utilities Segment [Member]
Operating Segment Revenues
Operating revenues	929	810	1,677	1,514
Operating Segment Income (Loss)
Operating income (loss)	343	290	490	473
Operating Segments [Member] | Resort Amenities Segment [Member]
Operating Segment Revenues
Operating revenues	248	292	509	599
Operating Segment Income (Loss)
Operating income (loss)	$ 40	$ 61	$ (24)	$ 15