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Note 13 - Stock Based Compensation - Additional Shares Authorized (Details) - shares	6 Months Ended	12 Months Ended								99 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2020
The 2010 Stock Option and Incentive Plan [Member]
Total additional shares (in shares)	365,239	233,862	106,076	12,623	7,257	5,463	4,128	2,871	2,502	740,021

X

- Definition

Number of additional shares automatically authorized for issuance under share-based compensation arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	atos_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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