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Note 10 - Segment Information - Financial Results for Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Segment Revenues    
Operating Revenues $ 2,794us-gaap_Revenues $ 2,469us-gaap_Revenues
Operating Segment Income (Loss)    
Operating Income (Loss) (496)us-gaap_OperatingIncomeLoss (432)us-gaap_OperatingIncomeLoss
Operating Segments [Member] | Leasing Segment [Member]    
Operating Segment Revenues    
Operating Revenues 1,415us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_LeasingSegmentMember
1,312us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_LeasingSegmentMember
Operating Segment Income (Loss)    
Operating Income (Loss) 883us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_LeasingSegmentMember
762us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_LeasingSegmentMember
Operating Segments [Member] | Real Estate Segment [Member]    
Operating Segment Revenues    
Operating Revenues 112us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_RealEstateSegmentMember
83us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_RealEstateSegmentMember
Operating Segment Income (Loss)    
Operating Income (Loss) (56)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_RealEstateSegmentMember
(196)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_RealEstateSegmentMember
Operating Segments [Member] | Resort Amenities Segment [Member]    
Operating Segment Revenues    
Operating Revenues 450us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_ResortAmenitiesSegmentMember
352us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_ResortAmenitiesSegmentMember
Operating Segment Income (Loss)    
Operating Income (Loss) 237us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_ResortAmenitiesSegmentMember
71us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_ResortAmenitiesSegmentMember
Operating Segments [Member] | Utilities Segment [Member]    
Operating Segment Revenues    
Operating Revenues 817us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_UtilitiesSegmentMember
722us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_UtilitiesSegmentMember
Operating Segment Income (Loss)    
Operating Income (Loss) $ 205us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_UtilitiesSegmentMember
$ 149us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mlp_UtilitiesSegmentMember