Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Segment Revenues
Operating revenues	$ 2,840	$ 6,062	$ 21,859	$ 27,017
Operating Segment Income (Loss)
Operating income (loss)	(445)	2,688	11,981	15,724
Operating Segments [Member]
Operating Segment Revenues
Operating revenues	2,840	6,062	21,859	27,017
Operating Segment Income (Loss)
Operating income (loss)	1,121	3,644	16,671	19,960
Operating Segments [Member] | Real Estate Segment [Member]
Operating Segment Revenues
Operating revenues	290	3,210	14,281	18,876
Operating Segment Income (Loss)
Operating income (loss)	(38)	2,768	13,065	16,778
Operating Segments [Member] | Leasing Segment [Member]
Operating Segment Revenues
Operating revenues	1,353	1,680	4,309	4,572
Operating Segment Income (Loss)
Operating income (loss)	692	560	2,592	2,195
Operating Segments [Member] | Utilities Segment [Member]
Operating Segment Revenues
Operating revenues	898	813	2,403	2,539
Operating Segment Income (Loss)
Operating income (loss)	410	124	936	630
Operating Segments [Member] | Resort Amenities Segment [Member]
Operating Segment Revenues
Operating revenues	299	359	866	1,030
Operating Segment Income (Loss)
Operating income (loss)	$ 57	$ 192	$ 78	$ 357