Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 14, 2021	Jun. 30, 2020
Cover [Abstract]
Entity Registrant Name	Atrion Corporation
Entity Central Index Key	0000701288
Document Type	10-K
Amendment Flag	false
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Well Known Seasoned Issuer	No
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Document Period End Date	Dec. 31, 2020
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Common Stock Shares Outstanding		1,825,472
Entity Public Float			$ 904,980,997
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity File Number	001-32982
Entity Incorporation State Country Code	DE
Entity Address Address Line 1	One Allentown Parkway
Entity Address City Or Town	Allen
Entity Address State Or Province	TX
Entity Tax Identification Number	63-0821819
City Area Code	972
Local Phone Number	390-9800
Entity Address Postal Zip Code	75002