Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share Reconciliation [Abstract]
Net income attributable to Karat Packaging Inc.	$ 6,667,000	$ 1,780,000
Weighted average number of common shares in issue (in shares)	19,807,584	15,167,000
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.12
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Net income attributable to Karat Packaging Inc.	$ 6,667,000	$ 1,780,000
Weighted average common shares outstanding, basic (in shares)	19,807,584	15,167,000
Dilutive shares
Stock options and restricted stock units (in shares)	93,000	236,000
Adjusted weighted average number of common shares (in shares)	19,901,384	15,403,000
Diluted earnings per share (in dollars per share)	$ 0.34	$ 0.12
Potentially dilutive shares excluded from diluted earnings per share calculation (in shares)	474,000	236,000