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Note 6 - Summary of Warrants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Outstanding (in shares)	3,153,367	3,153,367
Outstanding (in dollars per share)	$ 1	$ 1.01
Granted (in shares)	250,000
Granted (in dollars per share)	$ 1.25
Outstanding (in shares)	3,403,367	3,153,367
Outstanding (in dollars per share)	$ 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