EVENTS SUBSEQUENT TO BALANCE DATE (Details)	Jul. 05, 2018 a
Subsequent Events [Member]
Events subsequent to balance date [Abstract]
Area of property	60

The area of property associated to an exclusive option agreement related to the exploration of mineral rights.

No definition available.

Name:	plll_ExplorationAndEvaluationAssetsAreaOfLand
Namespace Prefix:	plll_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration