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Long-term Debt - Narrative (Details)					12 Months Ended
Long-term Debt - Narrative (Details)	Dec. 09, 2021 USD ($)	Jun. 14, 2021	Apr. 24, 2020 USD ($)	Nov. 08, 2018 USD ($)	Dec. 31, 2021 USD ($) facility	Dec. 31, 2020 USD ($)	Dec. 08, 2021 USD ($)	Sep. 21, 2021 USD ($)	Sep. 20, 2021 USD ($)
Debt Instrument [Line Items]
Total debt excluding Revolver					$ 28,884,000	$ 38,863,000
Debt issuance costs					248,000	376,000
Unamortized discount					187,000	285,000
Amortization of debt issuance costs					226,000	189,000
Gain on forgiveness of debt					6,000,000	0
Commercial Paper \| PPP under CARES Act
Debt Instrument [Line Items]
Gain on forgiveness of debt			$ 6,000,000		6,000,000
Interest rate			1.00%
Interest payable					$ 100,000
Revolving credit facility \| Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000,000						$ 27,000,000	$ 27,000,000	$ 30,000,000
Amended And Restated Credit Agreement
Debt Instrument [Line Items]
Minimum debt service coverage ratio					1.20
Amended And Restated Credit Agreement \| Fiscal Quarter Ending September 30, 2020
Debt Instrument [Line Items]
Maximum total leverage ratio					3.75
Amended And Restated Credit Agreement \| Fiscal Quarter Ending December 31, 2020
Debt Instrument [Line Items]
Maximum total leverage ratio					3.50
Amended And Restated Credit Agreement \| Fiscal Quarter Ending March 31, 2021
Debt Instrument [Line Items]
Maximum total leverage ratio					3.25
Amended And Restated Credit Agreement \| Fiscal Quarter Ending June 30, 2021
Debt Instrument [Line Items]
Maximum total leverage ratio					3.25
Amended And Restated Credit Agreement \| Fiscal Quarter Thereafter
Debt Instrument [Line Items]
Maximum total leverage ratio					3.00
Amended And Restated Credit Agreement \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 73,000,000.0
Amended And Restated Credit Agreement \| Line of credit \| Secured debt \| Base Rate \| Minimum \| PPP under CARES Act
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Amended And Restated Credit Agreement \| Line of credit \| Secured debt \| London Interbank Offered Rate (LIBOR) \| Minimum \| PPP under CARES Act
Debt Instrument [Line Items]
Basis spread on variable rate				1.00%
CA term loan \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Total debt excluding Revolver					$ 7,437,000	$ 8,876,000
Effective interest rate					5.50%	5.25%
Line of credit for capital expenditures
Debt Instrument [Line Items]
Total debt excluding Revolver					$ 1,064,000	$ 1,220,000
Credit agreement \| Line of credit \| Secured debt \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.75%
Credit agreement \| Line of credit \| Secured debt \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				3.25%
Credit agreement \| Line of credit \| Secured debt \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				2.75%
Credit agreement \| Line of credit \| Secured debt \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				4.25%
PPP under CARES Act \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Total debt excluding Revolver					$ 0	$ 5,999,000
Effective interest rate					1.00%
First Amendment To Forbearance Agreement \| Line of credit \| Secured debt \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		4.50%		4.25%
New revolver \| Revolving credit facility
Debt Instrument [Line Items]
Long-term line of credit					$ 19,800,000
New revolver \| Line of credit \| Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 2,200,000
Effective interest rate					5.50%
Forbearance Agreement \| Trailing 12 months
Debt Instrument [Line Items]
Limit to the excess above projected total cash disbursements (percent)					15.00%
Forbearance Agreement \| Line of credit
Debt Instrument [Line Items]
Total cash disbursements	15.00%
Forbearance Agreement \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Debt instrument interest rate					0.50%
Senior credit facility, second amendment \| Line of credit \| Revolving credit facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount					$ 100,000
Company's leased facilities \| facility					1
Debt instrument, periodic payment					$ 411,000
Unique Fabricating NA, Inc. And Unique-Intasco Canada, Inc. \| Amended And Restated Credit Agreement \| Line of credit
Debt Instrument [Line Items]
Debt instrument, term				5 years
Debt instrument, term to fund capital expenditures				2 years
Unique Fabricating NA, Inc. And Unique-Intasco Canada, Inc. \| Amended And Restated Credit Agreement \| Line of credit \| Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 30,000,000.0
Unique Fabricating NA, Inc. And Unique-Intasco Canada, Inc. \| Amended And Restated Credit Agreement \| Line of credit for capital expenditures \| November 8, 2018 through November 8, 2019
Debt Instrument [Line Items]
Maximum borrowing capacity				2,500,000
Unique Fabricating NA, Inc. And Unique-Intasco Canada, Inc. \| Amended And Restated Credit Agreement \| Line of credit for capital expenditures \| November 9, 2019 through November 8, 2020
Debt Instrument [Line Items]
Maximum borrowing capacity				5,000,000.0
Unique Fabricating NA, Inc. And Unique-Intasco Canada, Inc. \| US term loan \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Maximum increase to principal amount				26,000,000.0
Unique Fabricating NA, Inc. And Unique-Intasco Canada, Inc. \| CA term loan \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Total debt excluding Revolver				$ 12,000,000.0