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Note 3 - Discontinued Operations (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 09, 2018 | Mar. 31, 2021 | Mar. 31, 2020
Pension Termination [Member] |  |  |  |
Disposal Group, Including Discontinued Operation, Restructuriing Charge |  |  |  | $ (902,000)
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total |  | $ 63,326,000 |  |
Disposal Group, Including Discontinued Operation, Revenue, Percent |  | 15.00% |  |
Disposal Group, Including Discontinued Operation, Restructuriing Charge | [1] |  | $ 0 | $ (1,150,000)
[1] | Includes $902,000 credit for pension termination in fiscal 2020. Includes $3,746,000 of Modesto severance in fiscal 2019.

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- Definition Amount of restructuring charge attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
Name: | senea_DisposalGroupIncludingDiscontinuedOperationRestructuringCharge
Namespace Prefix: | senea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of revenue attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
Name: | senea_DisposalGroupIncludingDiscontinuedOperationRevenuePercent
Namespace Prefix: | senea_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=senea_PensionTerminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=senea_ModestoFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |