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Note 9 - Retirement Plans - Expected Contributions (Details) | Mar. 31, 2018 USD ($)
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Expected Employer Contributions |
Expected Employee Contributions |

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- Definition Amount of contributions expected to be received by defined benefit plan from employee in next fiscal year following latest fiscal year. + References No definition available. + Details
Name: | senea_DefinedBenefitPlanExpectedFutureEmployeeContributionsNextFiscalYear
Namespace Prefix: | senea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant