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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
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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
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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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- Details
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- Details
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- Details
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- Details
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