Cover - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-32982
Entity Tax Identification Number	63-0821819
City Area Code	972
Local Phone Number	390-9800
Entity Incorporation, State or Country Code	DE
One Allentown Parkway, Allen, Texas	One Allentown Parkway
Entity Address, City or Town	Allen
Entity Address, State or Province	TX
Common Stock, $.10 Par Value	Common Stock, $.10 Par Value
Trading Symbol	ATRI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,228,356,621
Entity Common Stock, Shares Outstanding		1,854,829
Amendment Description	EXPLANATORY NOTE  Atrion Corporation is filing this Amendment No. 1 on Form 10-K/A (“Form 10-K/A”) to its Annual Report on Form 10-K for the year ended December 31, 2019 as filed with the Securities and Exchange Commission on March 2, 2020 (the “Original Filing”) solely to include the hyperlinks to previously filed exhibits incorporated by reference that were inadvertently omitted from the Original Filing due to a clerical filing error.  Apart from the foregoing, this Form 10-K/A does not update or change any disclosures in or reflect any events occurring after the filing of the Original Filing.  Accordingly, this Form 10-K/A should be read in conjunction with the Original Filing.
Document Period End Date	Dec. 31, 2019
Entity Address, Postal Zip Code	75002
Entity Registrant Name	ATRION CORP
Entity Central Index Key	0000701288
Amendment Flag	true
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31