CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 102,711,000	$ 76,317,000	$ 272,910,000	$ 225,137,000
Cost of goods sold	72,918,000	53,286,000	193,393,000	155,308,000
Gross profit	29,793,000	23,031,000	79,517,000	69,829,000
Operating expenses:
Selling expense	9,855,000	6,112,000	24,026,000	16,241,000
General and administrative expense (including $0.7 million and $0.8 million associated with variable interest entity for the three months ended September 30, 2021 and 2020, respectively; and $2.0 million and $1.4 million for the nine months ended September 30, 2021 and 2020, respectively, associated with variable interest entity)	14,573,000	9,877,000	39,485,000	27,948,000
Total operating expenses	24,428,000	15,989,000	63,511,000	44,189,000
Operating income	5,365,000	7,042,000	16,006,000	25,640,000
Other income (expense)
Rental income (including $0.2 million and $0.0 associated with variable interest entity for the three months ended September 30, 2021 and 2020, respectively; and $0.7 million and $0.0 for the nine months ended September 30, 2021 and 2020, respectively, associated with variable interest entity)	246,000	66,000	738,000	66,000
Other income	101,000	24,000	223,000	86,000
Loss on foreign currency transactions	(63,000)	(268,000)	(347,000)	(377,000)
Interest expense (including $0.3 million and $0.3 million associated with variable interest entity for the three months ended September 30, 2021 and 2020, respectively; and $0.3 million and $2.9 million for the nine months ended September 30, 2021 and 2020, respectively, associated with variable interest entity)	(308,000)	(847,000)	(1,158,000)	(4,858,000)
Gain on forgiveness of debt	0	0	5,000,000	0
Total other income (expense)	(24,000)	(1,025,000)	4,456,000	(5,083,000)
Income before provision for income tax	5,341,000	6,017,000	20,462,000	20,557,000
Provision for income tax	1,268,000	1,451,000	4,001,000	5,483,000
Net income	4,073,000	4,566,000	16,461,000	15,074,000
Net income (loss) attributable to noncontrolling interest	287,000	494,000	1,312,000	(1,521,000)
Net income attributable to Karat Packaging Inc.	$ 3,786,000	$ 4,072,000	$ 15,149,000	$ 16,595,000
Basic and diluted earnings per share:
Basic (in dollars per share)	$ 0.19	$ 0.27	$ 0.84	$ 1.09
Diluted (in dollars per share)	$ 0.19	$ 0.26	$ 0.84	$ 1.07
Weighted average common shares outstanding, basic (in shares)	19,710,043	15,180,879	17,945,205	15,185,440
Weighted average common shares outstanding, diluted (in shares)	19,881,295	15,451,879	18,110,127	15,456,440