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Note 10 - Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Reported Value Measurement [Member] |  |
Long-term debt, including current portion | $ 417,834 | $ 332,633
Capital leases, including current portion | 42,009 | 39,033
Estimate of Fair Value Measurement [Member] |  |
Long-term debt, including current portion | 417,485 | 332,926
Capital leases, including current portion | $ 39,023 | $ 37,505

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- Definition Fair value of capital lease obligations. + References No definition available. + Details
Name: | senea_CapitalLeaseObligationsFairValueDisclosure
Namespace Prefix: | senea_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |