Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic earnings per share calculation
Net income attributable to Karat Packaging Inc.	$ 1,780,000	$ 2,451,000
Weighted average number of common shares in issue	15,167,000	15,190,000
Basic earnings per share	$ 0.12	$ 0.16
Diluted earnings per share calculation
Net income attributable to Karat Packaging Inc.	$ 1,780,000	$ 2,451,000
Weighted average number of common shares in issue	15,167,000	15,190,000
Dilutive shares
Stock options and restricted stock units	236,000	271,000
Adjusted weighted average number of comman shares	15,403,000	15,461,000
Diluted earnings per share	$ 0.12	$ 0.16
Potentially dilutive shares excluded from diluted earnings per share calculation	236,000