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Note 6 - Summary of Warrants Issued and Outstanding (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares
Expires on January 1, 2017 [Member]
Remaining Contractual Life	1 year 73 days
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.25
Expires on July 7, 2021 [Member] | Minimum [Member]
Remaining Contractual Life	5 years 182 days
Expires on July 7, 2021 [Member] | Maximum [Member]
Remaining Contractual Life	6 years 255 days
Expires on July 7, 2021 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1
Expires on December 20, 2023 [Member] | Minimum [Member]
Remaining Contractual Life	7 years 109 days
Expires on December 20, 2023 [Member] | Maximum [Member]
Remaining Contractual Life	8 years 36 days
Expires on December 20, 2023 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.05
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1

X

- Definition

Weighted average remaining contractual term for warrants or rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	atrn_
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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

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X

- Details

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X

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