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Note 15 - Restatement to Previously Issued Condensed Consolidated Financial Statements (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Preferred Stock, Deemed Dividend | $ 11,479,308 | $ 11,479,308 | $ 11,479,308 | $ 2,568,132
Series B Convertible Preferred Stock [Member] |  |  |  |
Deemed Dividend on Series B Convertible Preferred Stock | 11,479,308 |  |  |
Previously Reported [Member] |  |  |  |
Preferred Stock, Deemed Dividend | 4,782,100 | $ 4,782,100 |  |
Previously Reported [Member] | Series B Convertible Preferred Stock [Member] |  |  |  |
Preferred Stock, Deemed Dividend | $ 4,782,100 |  |  |

X
- Definition The amount of deemed dividend on Series B Convertible Preferred Stock. + References No definition available. + Details
Name: | atos_DeemedDividendOnSeriesBConvertiblePreferredStock
Namespace Prefix: | atos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of deemed dividend on preferred stock. + References No definition available. + Details
Name: | atos_PreferredStockDeemedDividend
Namespace Prefix: | atos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=atos_SeriesBConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |