CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Total Stockholders’ Equity attributable to Karat Packaging Inc.	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest
Balance at the beginning of period (in shares) at Dec. 31, 2019			15,190,000	0
Balance at the beginning of period at Dec. 31, 2019	$ 24,054	$ 15,741	$ 15	$ 0	$ 13,981	$ 1,745	$ 8,313
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	567	2,451				2,451	(1,884)
Balance at the end of period (in shares) at Mar. 31, 2020			15,190,000	0
Balance at the end of period at Mar. 31, 2020	24,621	18,192	$ 15	$ 0	13,981	4,196	6,429
Balance at the beginning of period (in shares) at Dec. 31, 2019			15,190,000	0
Balance at the beginning of period at Dec. 31, 2019	24,054	15,741	$ 15	$ 0	13,981	1,745	8,313
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	15,074
Balance at the end of period (in shares) at Sep. 30, 2020			15,190,000	23,000
Balance at the end of period at Sep. 30, 2020	38,273	31,481	$ 15	$ (248)	13,981	17,733	6,792
Balance at the beginning of period (in shares) at Mar. 31, 2020			15,190,000	0
Balance at the beginning of period at Mar. 31, 2020	24,621	18,192	$ 15	$ 0	13,981	4,196	6,429
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired (in shares)				(10,000)
Treasury stock acquired	(107)	(107)		$ (107)
Cash dividends	(607)	(607)				(607)
Net income (loss)	9,941	10,072				10,072	(131)
Balance at the end of period (in shares) at Jun. 30, 2020			15,190,000	10,000
Balance at the end of period at Jun. 30, 2020	33,848	27,550	$ 15	$ (107)	13,981	13,661	6,298
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock acquired (in shares)				(13,000)
Treasury stock acquired	(141)	(141)		$ (141)
Cash dividends	0
Net income (loss)	4,566	4,072				4,072	494
Balance at the end of period (in shares) at Sep. 30, 2020			15,190,000	23,000
Balance at the end of period at Sep. 30, 2020	$ 38,273	31,481	$ 15	$ (248)	13,981	17,733	6,792
Balance at the beginning of period (in shares) at Dec. 31, 2020	15,167,000		15,190,000	23,000
Balance at the beginning of period at Dec. 31, 2020	$ 39,868	32,404	$ 15	$ (248)	13,981	18,656	7,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,050	1,780				1,780	1,270
Balance at the end of period (in shares) at Mar. 31, 2021			15,190,000	23,000
Balance at the end of period at Mar. 31, 2021	$ 42,918	34,184	$ 15	$ (248)	13,981	20,436	8,734
Balance at the beginning of period (in shares) at Dec. 31, 2020	15,167,000		15,190,000	23,000
Balance at the beginning of period at Dec. 31, 2020	$ 39,868	32,404	$ 15	$ (248)	13,981	18,656	7,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 16,461
Balance at the end of period (in shares) at Sep. 30, 2021	19,714,500		19,737,500	23,000
Balance at the end of period at Sep. 30, 2021	$ 125,009	116,233	$ 20	$ (248)	82,656	33,805	8,776
Balance at the beginning of period (in shares) at Mar. 31, 2021			15,190,000	23,000
Balance at the beginning of period at Mar. 31, 2021	42,918	34,184	$ 15	$ (248)	13,981	20,436	8,734
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with our initial public offering, net of issuance costs of $5,088 (in shares)			4,542,500
Issuance of common stock in connection with our initial public offering, net of issuance costs of $5,088	67,592	67,592	$ 5		67,587
Stock-based compensation	240	240			240
Net income (loss)	9,338	9,583				9,583	(245)
Balance at the end of period (in shares) at Jun. 30, 2021			19,732,500	23,000
Balance at the end of period at Jun. 30, 2021	120,088	111,599	$ 20	$ (248)	81,808	30,019	8,489
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	848	848			848
Issuance of common stock upon vesting of restricted stock units (in shares)			5,000
Net income (loss)	$ 4,073	3,786				3,786	287
Balance at the end of period (in shares) at Sep. 30, 2021	19,714,500		19,737,500	23,000
Balance at the end of period at Sep. 30, 2021	$ 125,009	$ 116,233	$ 20	$ (248)	$ 82,656	$ 33,805	$ 8,776