CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 94,526,000	$ 84,737,000	$ 170,199,000	$ 148,820,000
Cost of goods sold	66,428,000	55,830,000	120,475,000	102,022,000
Gross profit	28,098,000	28,907,000	49,724,000	46,798,000
Operating expenses:
Selling expense	7,771,000	5,428,000	14,171,000	10,129,000
General and administrative expense (including $0.7 million and $0.5 million associated with variable interest entity for the three months ended June 30, 2021 and 2020, respectively; and $1.3 million and $0.6 million for the six months ended June 30, 2021 and 2020, respectively, associated with variable interest entity)	13,457,000	8,969,000	24,912,000	18,071,000
Total operating expenses	21,228,000	14,397,000	39,083,000	28,200,000
Operating income	6,870,000	14,510,000	10,641,000	18,598,000
Other income (expense)
Rental income (including $0.2 million and $0.0 associated with variable interest entity for the three months ended June 30, 2021 and 2020, respectively; and $0.5 million and $0.0 for the six months ended June 30, 2021 and 2020, respectively, associated with variable interest entity)	246,000	0	492,000	0
Other income	16,000	28,000	122,000	54,000
Loss on foreign currency transactions	(119,000)	(68,000)	(284,000)	(109,000)
Gain on sale of asset	0	8,000	0	8,000
Interest income (expense) (including $0.8 million interest expense and $0.1 million interest expense associated with variable interest entity for the three months ended June 30, 2021 and 2020, respectively; and $0.0 million interest expense and $2.6 million interest expense for the six months ended June 30, 2021 and 2020, respectively, associated with variable interest entity)	(1,128,000)	(705,000)	(850,000)	(4,011,000)
Forgiveness of PPP loan	5,000,000	0	5,000,000	0
Total other income (expense)	4,015,000	(737,000)	4,480,000	(4,058,000)
Income before provision for income tax	10,885,000	13,773,000	15,121,000	14,540,000
Provision for income tax	1,547,000	3,832,000	2,733,000	4,032,000
Net income	9,338,000	9,941,000	12,388,000	10,508,000
Net income (loss) attributable to noncontrolling interest	(245,000)	(131,000)	1,025,000	(2,015,000)
Net income attributable to Karat Packaging Inc.	$ 9,583,000	$ 10,072,000	$ 11,363,000	$ 12,523,000
Basic and diluted earnings per share:
Basic (in dollars per share)	$ 0.51	$ 0.66	$ 0.67	$ 0.82
Diluted (in dollars per share)	$ 0.50	$ 0.65	$ 0.66	$ 0.81
Weighted average common shares outstanding, basic (in shares)	18,908,648	15,180,879	17,048,160	15,185,440
Weighted average common shares outstanding, diluted (in shares)	19,025,871	15,451,879	17,165,383	15,456,440