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Note 10 - Licensing Agreements (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Royalty Payment on Behalf of Sub-licensee, Percentage | 2.50% |
Revenues | $ 0 | $ 0
Licensing Agreements [Member] |  |
Royalty Payment, Percentage | 2.50% |
Up-front Sub-license Fees, Percentage | 10.00% |
Interest on Amounts Owed Under License Agreement, Rate | 3.00% |

X
- Definition The interest rate charged per annum on any amounts owed under the license agreement and amendment. + References No definition available. + Details
Name: | ptix_InterestOnAmountsOwedUnderLicenseAgreementRate
Namespace Prefix: | ptix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of royalty payment of net sales made on behalf of a sub-licensee. + References No definition available. + Details
Name: | ptix_RoyaltyPaymentOnBehalfOfSublicenseePercentage
Namespace Prefix: | ptix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of royalty payment of net sales. + References No definition available. + Details
Name: | ptix_RoyaltyPaymentPercentage
Namespace Prefix: | ptix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of Up-front sub-license fees, for any sub-licenses that occur on or after September 9, 2006, the company agree to pay under an agreement. + References No definition available. + Details
Name: | ptix_UpFrontSubLicenseFeesPercentage
Namespace Prefix: | ptix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |