v3.7.0.1

Fair Value of Assumptions of Options Estimated on Grant Date (Detail) - $ / shares	9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Assumptions used to Determine Fair Value Options [Line Items]
Dividends per year	$ 0	$ 0
Volatility percentage	0.00%	606.00%
Risk free interest rate	0.00%	4.00%
Expected life (years)	0 years	5 years
Weighted Average Fair Value	$ 0	$ 5.41

Assumptions used to Determine Fair Value Options [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	prtx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted Average Fair Value of Options Granted

+ References

No definition available.

+ Details

Name:	prtx_WeightedAverageFairValueOfOptionsGranted
Namespace Prefix:	prtx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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