Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 20, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	ATRION CORP
Entity Central Index Key	0000701288
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		1,852,756
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019