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Note 7 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Capital Leased Assets, Gross, Total	$ 50,586	$ 47,000
Operating Leases, Rent Expense, Total	39,200	39,700
Building [Member]
Capital Leased Assets, Gross, Total	$ 5,313	5,313
Capital Lease Obligations, Interest Rate	5.15%
Equipment [Member]
Capital Leased Assets, Gross, Total	$ 45,273	$ 41,687
Capital Leases, Term	7 years
Equipment [Member] | Minimum [Member]
Capital Lease Obligations, Interest Rate	3.37%
Equipment [Member] | Maximum [Member]
Capital Lease Obligations, Interest Rate	4.52%

X

- Definition

Represents the interest rate of capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	senea_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the capital leases term.

+ References

No definition available.

+ Details

Name:	senea_CapitalLeasesTerm
Namespace Prefix:	senea_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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Period Type:

X

- Details

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X

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