Stock-based compensation (Details) (USD $)	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Stock-based compensation Details
Company expenesd stock based compensation	$ 25,000	$ 2,000	$ 85,000	$ 6,000

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

No definition available.

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