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Note B - Investments (Details Narrative) (USD $)	Mar. 31, 2013
Note B - Investments Details Narrative
Cumulative par value of investments	$ 6,601,000

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	PTIX_CumulativeParValueOfInvestments
Namespace Prefix:	PTIX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	PTIX_NoteBInvestmentsDetailsAbstract
Namespace Prefix:	PTIX_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration