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Note 6 - Derivative Liabilities (Details Textual) - Private Placement [Member] - $ / shares	Feb. 12, 2016	Apr. 15, 2016
Placement Agent Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 1.25
Series B Preferred Stock [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.25
Class of Warrant or Right, Expiration Period	5 years
Series B Preferred Stock [Member] | Strategic Bio Partners [Member] | Debt Settlement [Member]
Class of Warrant or Right, Issued During Period	295,945
Series B Preferred Stock [Member] | Placement Agent Warrants [Member]
Class of Warrant or Right, Issued During Period	127,346

X

- Definition

Expiration period of warrants or rights.

+ References

No definition available.

+ Details

Name:	ptix_ClassOfWarrantOrRightExpirationPeriod
Namespace Prefix:	ptix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of warrants or rights issued during period.

+ References

No definition available.

+ Details

Name:	ptix_ClassOfWarrantOrRightIssuedDuringPeriod
Namespace Prefix:	ptix_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=ptix_PlacementAgentWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ptix_StrategicBioPartnersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ptix_DebtSettlementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: