Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-14775
Entity Registrant Name	DMC Global Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-0608431
Entity Address, Address Line One	11800 Ridge Parkway
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Broomfield
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80021
City Area Code	303
Local Phone Number	665-5700
Title of 12(b) Security	Common Stock, $.05 Par Value
Trading Symbol	BOOM
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 264,854,982
Entity Common Stock, Shares Outstanding		15,389,285
Documents Incorporated by Reference	Certain information required by Items 10, 11, 12, 13 and 14 of Form 10-K is incorporated by reference into Part III hereof from the registrant’s proxy statement for its 2021 Annual Meeting of Stockholders, which is expected to be filed with the Securities and Exchange Commission (“SEC”) within 120 days of the close of the registrant’s fiscal year ended December 31, 2020.
Entity Central Index Key	0000034067
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false