XML 67 R54.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 6 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Line of Credit [Member] |  |
Long-term debt, weighted average interest rate | 1.38% | 2.59%
Term Loan [Member] |  |
Long-term debt, weighted average interest rate | 3.30% | 4.54%
Tax-exempt Bond [Member] |  |
Long-term debt, weighted average interest rate | 0.00% | 3.01%
Economic Development Note [Member] |  |
Long-term debt, weighted average interest rate | 2.00% | 2.00%

X
- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=senea_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=senea_TaxExemptBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=senea_EconomicDevelopmentNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |