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v3.22.1

Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2022
Notes Tables |
Property, Plant and Equipment, Useful Life [Table Text Block] |
|  | Years |
Land improvements |  |  | 10 | - | 20 |
Buildings and improvements |  |  |  | 30 |  |
Machinery & equipment |  |  | 10 | - | 15 |
Office furniture |  |  | 3 | - | 5 |
Vehicles |  |  | 3 | - | 7 |
Computer software |  |  | 3 | - | 5

X
- Definition Tabular disclosure of the useful life of physical assets used in the normal conduct of business and not intended for resale. + References No definition available. + Details
Name: | senea_PropertyPlantAndEquipmentUsefulLifeTableTextBlock
Namespace Prefix: | senea_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration