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Note 13 - Debt (Details Textual) |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 09, 2016 USD ($) a | Mar. 09, 2016 MXN ($) a | Dec. 31, 2020 USD ($) | Jul. 05, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 | Feb. 28, 2019 USD ($)
Interest Costs Capitalized |  |  |  |  |  | $ 0 | $ 0 |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  |  |  |  | 369,000 | 526,000 |  |
Proceeds from Notes Payable, Total |  |  |  |  |  | 3,558,000 | 0 |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  |  |  | 1,969,000 | $ 1,858,000 |  |
Finance Lease, Liability, Total |  |  |  | $ 2,320,000 |  | 2,320,000 |  |  |
Machinery at Sypris Technologies Facility [Member] |  |  |  |  |  |  |  |  |
Lessee, Finance Lease, Term of Contract (Year) |  |  |  |  |  |  |  |  | 5 years
Finance Lease, Liability, Total |  |  |  | 181,000 |  | 181,000 |  |  | $ 269,000
Toluca Property [Member] |  |  |  |  |  |  |  |  |
Area of Land (Acre) | a |  | 24 | 24 |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  | $ 12,182,000 | $ 215,000,000 |  |  |  |  |  |
Lessee, Finance Lease, Term of Contract (Year) |  | 10 years | 10 years |  |  |  |  |  |
Sale Leaseback Transaction, Portion of Real Estate Property Leased Back to Seller (Acre) | a |  | 9 | 9 |  |  |  |  |  |
Finance Lease, Liability, Total |  |  |  | $ 2,139,000 |  | $ 2,139,000 |  |  |
Outstanding Borrowings [Member] |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 5.50% |  | 5.50% | 8.00% |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |
Proceeds from Notes Payable, Total |  |  |  |  | $ 3,558,000 |  |  |  |
Notes Payable, Total |  |  |  |  | $ 3,558,000 |  |  |  |
Promissory Notes with Maturity on April 1, 2021 and April 1, 2023 [Member] | Gill Family Capital Management [Member] |  |  |  |  |  |  |  |  |
Subordinated Debt, Ending Balance |  |  |  | $ 6,500,000 |  | $ 6,500,000 | $ 6,500,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 8.00% |
Debt Instrument, Allowance for Payment Deferral Period (Month) |  |  |  | 1 year |  | 1 year 180 days |  |  |
Debt Instrument, Maximum Allowance of Interest Due on Deferred Payments, Percent |  |  |  |  |  | 60.00% |  |  |
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% |  |  |  |  |  |  |  |
Promissory Note with Maturity on April 1, 2021 [Member] | Gill Family Capital Management [Member] |  |  |  |  |  |  |  |  |
Subordinated Debt, Ending Balance |  |  |  | $ 2,500,000 |  | $ 2,500,000 |  |  |
Promissory Note with Maturity on April 1, 2023 [Member] | Gill Family Capital Management [Member] |  |  |  |  |  |  |  |  |
Subordinated Debt, Ending Balance |  |  |  | $ 2,000,000 |  | $ 2,000,000 |  |  |

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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