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Note 10 - Reportable Operating Segments - Financial Results for Reportable Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Segment Revenues    
Operating revenues $ 2,542 $ 9,683
Operating Segment Income (Loss)    
Operating income (loss) (825) 6,128
Operating Segments [Member]    
Operating Segment Revenues    
Operating revenues 2,542 9,683
Operating Segment Income (Loss)    
Operating income (loss) 1,024 7,592
Operating Segments [Member] | Real Estate Segment [Member]    
Operating Segment Revenues    
Operating revenues 36 7,139
Operating Segment Income (Loss)    
Operating income (loss) (30) 6,403
Operating Segments [Member] | Leasing Segment [Member]    
Operating Segment Revenues    
Operating revenues 1,495 1,586
Operating Segment Income (Loss)    
Operating income (loss) 917 1,117
Operating Segments [Member] | Utilities Segment [Member]    
Operating Segment Revenues    
Operating revenues 704 676
Operating Segment Income (Loss)    
Operating income (loss) 183 123
Operating Segments [Member] | Resort Amenities Segment [Member]    
Operating Segment Revenues    
Operating revenues 307 282
Operating Segment Income (Loss)    
Operating income (loss) $ (46) $ (51)