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Note 10 - Debt (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 28, 2021 | Apr. 01, 2021 | Apr. 04, 2021 | Jul. 05, 2020 | Jul. 04, 2021 | Jul. 05, 2020 | Dec. 31, 2020
Proceeds from Notes Payable, Total |  |  |  |  | $ 0 | $ 3,558,000 |
Finance Lease, Liability, Total |  |  |  |  | 2,274,000 |  |
Machinery at Sypris Technologies Facility [Member] |  |  |  |  |  |  |
Finance Lease, Liability, Total |  |  |  |  | $ 2,274,000 |  |
Machinery at Sypris Technologies Facility [Member] | Finance Lease Obligations [Member] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  | 10.03% |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |
Proceeds from Notes Payable, Total |  |  |  | $ 3,558,000 |  |  |
Notes Payable, Total |  |  |  | $ 3,558,000 |  | $ 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 |  |  |  |  | $ 1,006,000 |  |
Equipment Financing Obligations [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.06% |  |
Equipment Financing Obligations [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 8.06% |  |

X
- Definition 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. + References No definition available. + Details
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