Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Real Estate Segment [Member] | Operating Segments [Member]
Operating Segment Revenues
Operating Revenues	$ 3,210	$ 12,054	$ 18,876	$ 12,377
Operating Segment Income (Loss)
Operating Income (Loss)	2,768	10,438	16,778	10,344
Leasing Segment [Member] | Operating Segments [Member]
Operating Segment Revenues
Operating Revenues	1,680	1,311	4,572	4,148
Operating Segment Income (Loss)
Operating Income (Loss)	560	855	2,195	2,538
Utilities Segment [Member] | Operating Segments [Member]
Operating Segment Revenues
Operating Revenues	813	785	2,539	2,409
Operating Segment Income (Loss)
Operating Income (Loss)	124	206	630	635
Resort Amenities Segment [Member] | Operating Segments [Member]
Operating Segment Revenues
Operating Revenues	359	330	1,030	1,105
Operating Segment Income (Loss)
Operating Income (Loss)	192	123	357	419
Operating Segments [Member]
Operating Segment Revenues
Operating Revenues	6,062	14,480	27,017	20,039
Operating Segment Income (Loss)
Operating Income (Loss)	3,644	11,622	19,960	13,936
Operating Revenues	6,062	14,480	27,017	20,039
Operating Income (Loss)	$ 2,688	$ 10,394	$ 15,724	$ 9,681