Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jun. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0000320340
Entity Registrant Name	CoreCard Corp
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	1-9330
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1964787
Entity Address, Address Line One	One Meca Way
Entity Address, City or Town	Norcross
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30093
City Area Code	770
Local Phone Number	381‑2900
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	CCRD
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 223,737,354
Entity Common Stock, Shares Outstanding		8,657,822
Auditor Name	Nichols, Cauley and Associates, LLC
Auditor Location	Atlanta, Georgia
Auditor Firm ID	281
ICFR Auditor Attestation Flag	true