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Note 13 - Debt (Details Textual) |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 09, 2016 USD ($) a | Mar. 09, 2016 MXN ($) a | Jan. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 31, 2016 USD ($)
Capital Lease Obligations, Total |  |  |  | $ 1,277,000 | $ 772,000 |  |
Capital Lease Obligations [Member] |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 3 years |  |  |
Toluca [Member] |  |  |  |  |  |  |
Sale Leaseback Transaction, Amount Due under Financing Arrangement |  |  |  |  | 2,764,000 |  |
Toluca [Member] | Sypris Technologies Mexico, S. de R.L. de C.V. [Member] |  |  |  |  |  |  |
Area of Land | a |  | 24 | 24 |  |  |  |
Sale Leaseback Transaction, Net Proceeds, Investing Activities, Total |  | $ 12,182,000 | $ 215,000,000 |  |  |  |
Sale Leaseback Transaction, Term of Lease |  | 10 years | 10 years |  |  |  |
Sale Leaseback Transaction, Portion of Real Estate Property Leased Back to Seller | a |  | 9 | 9 |  |  |  |
Promissory Note [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% |  |
Promissory Note [Member] | Gill Family Capital Management [Member] | Five-year Treasury Note Average During Preceding 90-day Period [Member] | Scenario, Forecast [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 |  |
Promissory Note with Maturity on April 1, 2023 [Member] | Gill Family Capital Management [Member] |  |  |  |  |  |  |
Subordinated Debt, Ending Balance |  |  |  |  | $ 2,000,000 |  |
Promissory Notes with Maturity on April 1, 2021 and April 1, 2023 [Member] | Gill Family Capital Management [Member] |  |  |  |  |  |  |
Debt Instrument, Allowance for Payment Deferral Period |  |  |  |  | 1 year 180 days |  |
Debt Instrument, Maximum Allowance of Interest Due on Deferred Payments, Percent |  |  |  |  | 60.00% |  |

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- 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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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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