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Note 9 - Stockholders' Equity - 2017 Liability Warrant Activity (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Outstanding as of January 1, 2017 (in shares) | shares | 0
Outstanding as of January 1, 2017 (in dollars per share) | $ / shares | $ 0
Warrants granted (in shares) | shares | 488,611
Warrants granted, exercise price (in dollars per share) | $ / shares | $ 11.25
Warrants exercised (in shares) | shares | (488,611)
Warrants exercised, , exercise price (in dollars per share) | $ / shares | $ 3.12
Outstanding as of December 31, 2017 (in shares) | shares | 0
Outstanding as of December 31, 2017 (in dollars per share) | $ / shares | $ 0

X
- Definition Number of warrants exercised during period. + References No definition available. + Details
Name: | atos_ClassOfWarrantOrRightExercised
Namespace Prefix: | atos_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit exercised of warrants or rights outstanding. + References No definition available. + Details
Name: | atos_ClassOfWarrantOrRightExercisedExercisePrice
Namespace Prefix: | atos_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
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Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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