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Note 7 - Stockholders' Equity (Deficit) - Summary of Warrants (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Outstanding January 1, 2016 (in shares) | 3,403,367 |
Outstanding January 1, 2016 (in dollars per share) | $ 1.03 |
Outstanding January 1, 2016 (Year) | 5 years 222 days | 5 years 292 days
Granted (in shares) | 423,291 |
Granted (in dollars per share) | $ 1.25 |
Granted (Year) | 4 years 43 days |
Outstanding December 31, 2016 (in shares) | 3,826,658 | 3,403,367
Outstanding December 31, 2016 (in dollars per share) | $ 1.07 | $ 1.03

X
- Definition Exercise price per share or per unit of warrants or rights granted in period. + References No definition available. + Details
Name: | ptix_ClassOfWarrantOrRightGrantInPeriodExercisePriceOfWarrantsOrRights
Namespace Prefix: | ptix_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average remaining contractual term of warrants granted during the reporting period. + References No definition available. + Details
Name: | ptix_ClassOfWarrantOrRightGrantsInPeriodWeightedAverageRemainingContractualTerm
Namespace Prefix: | ptix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the warrant or right plan. + References No definition available. + Details
Name: | ptix_ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice
Namespace Prefix: | ptix_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term for warrants or rights. + References No definition available. + Details
Name: | ptix_ClassOfWarrantOrRightWeightedAverageRemainingContractualTerm
Namespace Prefix: | ptix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights granted during the period. + References No definition available. + Details
Name: | ptix_ClassOfWarrantsOrRightGrantedInPeriod
Namespace Prefix: | ptix_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant