| Cover | Aug. 06, 2020 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 6, 2020 |
| Entity File Number | 001-32982 |
| Entity Registrant Name | ATRION CORP |
| Entity Central Index Key | 0000701288 |
| Entity Tax Identification Number | 63-0821819 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | One Allentown Parkway |
| Entity Address, City or Town | Allen |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75002 |
| City Area Code | 972 |
| Local Phone Number | 390-9800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.10 per share |
| Trading Symbol | ATRI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
