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Note 14 - Stock Based Compensation - Additional Shares Authorized (Details) - shares | 12 Months Ended | 84 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2018
The 2010 Stock Option and Incentive Plan [Member] |  |  |  |  |  |  |  |
Total additional shares (in shares) | 106,076 | 12,623 | 7,257 | 5,463 | 4,128 | 2,871 | 2,502 | 140,920

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- Definition Number of additional shares automatically authorized for issuance under share-based compensation arrangement. + References No definition available. + Details
Name: | atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAutomaticallyAuthorized
Namespace Prefix: | atos_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=atos_The2010StockOptionAndIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |