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Note 6 - Summary of Warrants (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Outstanding January 1, 2016 (in shares) | 3,403,367 | 3,153,367 | 3,153,367
Outstanding January 1, 2016 (in dollars per share) | $ 1.05 | $ 1 | $ 1.01
Granted (in shares) | 423,291 | 250,000 |
Granted (in dollars per share) | $ 1.25 | $ 1.25 |
Outstanding September 30, 2016 (in shares) | 3,826,658 | 3,403,367 | 3,153,367
Outstanding September 30, 2016 (in dollars per share) | $ 1.07 | $ 1.05 | $ 1

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

X
- Definition Number of warrants or rights granted during the period. + References No definition available. + Details
Name: | atrn_ClassOfWarrantsOrRightGrantedInPeriod
Namespace Prefix: | atrn_
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