Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share Reconciliation [Abstract]
Net income attributable to Karat Packaging Inc.	$ 9,583,000	$ 10,072,000	$ 11,363,000	$ 12,523,000
Weighted average number of common shares in issue (in shares)	18,908,648	15,180,879	17,048,160	15,185,440
Basic earnings per share (in dollars per share)	$ 0.51	$ 0.66	$ 0.67	$ 0.82
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Net income attributable to Karat Packaging Inc.	$ 9,583,000	$ 10,072,000	$ 11,363,000	$ 12,523,000
Weighted average common shares outstanding, basic (in shares)	18,908,648	15,180,879	17,048,160	15,185,440
Dilutive shares
Stock options and restricted stock units (in shares)	117,223	271,000	117,223	271,000
Adjusted weighted average number of common shares (in shares)	19,025,871	15,451,879	17,165,383	15,456,440
Diluted earnings per share (in dollars per share)	$ 0.50	$ 0.65	$ 0.66	$ 0.81
Potentially dilutive shares excluded from diluted earnings per share calculation (in shares)			143,777