CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Total Stockholders' Equity attributable to Karat Packaging Inc.	Noncontrolling Interest	Total
Balance at the beginning at Dec. 31, 2019	$ 15,000		$ 13,981,000	$ 1,745,000	$ 15,741,000	$ 8,313,000	$ 24,054,000
Balance at the beginning (in shares) at Dec. 31, 2019	15,190,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				2,451,000	2,451,000	(1,884,000)	567,000
Balance at the end at Mar. 31, 2020	$ 15,000		13,981,000	4,196,000	18,192,000	6,429,000	24,621,000
Balance at the end (in shares) at Mar. 31, 2020	15,190,000
Balance at the beginning at Dec. 31, 2020	$ 15,000	$ (248,000)	13,981,000	18,656,000	32,404,000	7,464,000	$ 39,868,000
Balance at the beginning (in shares) at Dec. 31, 2020	15,190,000	(23,000)					15,167,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				1,780,000	1,780,000	1,270,000	$ 3,050,000
Balance at the end at Mar. 31, 2021	$ 15,000	$ (248,000)	$ 13,981,000	$ 20,436,000	$ 34,184,000	$ 8,734,000	$ 42,918,000
Balance at the end (in shares) at Mar. 31, 2021	15,190,000	(23,000)					15,167,000