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Note 10 - Debt (Details Textual) - USD ($)			3 Months Ended		9 Months Ended
	Jun. 28, 2021	Apr. 01, 2021	Apr. 04, 2021	Jul. 04, 2020	Oct. 03, 2021	Oct. 04, 2020	Dec. 31, 2020	Jul. 05, 2020
Proceeds from Notes Payable, Total					$ 0	$ 3,558,000
Finance Lease, Liability, Total					2,165,000
Machinery at Sypris Technologies Facility [Member]
Finance Lease, Liability, Total					$ 2,165,000
Machinery at Sypris Technologies Facility [Member] | Finance Lease Obligations [Member]
Debt, Weighted Average Interest Rate					10.04%
Paycheck Protection Program CARES Act [Member]
Proceeds from Notes Payable, Total				$ 3,558,000
Notes Payable, Total								$ 3,558,000
Debt Instrument, Decrease, Forgiveness	$ 3,558,000				$ 3,599,000
Promissory Notes with Maturity on April 1, 2022 and April 1, 2024 [Member] | Gill Family Capital Management [Member]
Subordinated Debt, Ending Balance					6,500,000		$ 6,500,000
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Debt Instrument, Allowance for Payment Deferral Period (Month)			18 months
Debt Instrument, Maximum Allowance of Interest Due on Deferred Payments, Percent			60.00%
Promissory Notes with Maturity on April 1, 2022 [Member] | Gill Family Capital Management [Member]
Subordinated Debt, Ending Balance					2,500,000
Promissory Notes with Maturity on April 1, 2024 [Member] | Gill Family Capital Management [Member]
Subordinated Debt, Ending Balance					2,000,000
Promissory Note [Member] | Gill Family Capital Management [Member] | Five-year Treasury Note Average During Preceding 90-day Period [Member]
Debt Instrument, Basis Spread on Variable Rate		5.00%
Equipment Financing Obligations [Member]
Long-term Debt, Total					$ 1,067,000
Equipment Financing Obligations [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage					4.55%
Equipment Financing Obligations [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Effective Percentage					8.06%

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Period of time allowed for deferral of payment of the debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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