PATENT COSTS (Details) - USD ($)	3 Months Ended	6 Months Ended
Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
PATENT COSTS DETAILS
Capitalized patent costs totaled	$ 0	$ 3,000	$ 7,000	$ 5,000

Gross carrying amount before accumulated amortization during the period of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights.

No definition available.

Name:	fil_CapitalizedPatentCostsTotaled
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration