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Note 10 - Plant Restructuring (Details Textual) - USD ($)	3 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Closing of Northeast Plant [Member]
Restructuring Charges, Total	$ 263,000
Closing of Northeast Plant [Member] | Employee Severance [Member]
Restructuring Charges, Total	219,000
Closing of Northeast Plant [Member] | Lease Impairments [Member]
Restructuring Charges, Total	$ 44,000
Closing of Midwest and Northwest Plants [Member]
Restructuring Charges, Total		$ 4,806,000
Closing of Midwest and Northwest Plants [Member] | Employee Severance [Member]
Restructuring Charges, Total		586,000
Closing of Midwest and Northwest Plants [Member] | Lease Impairments [Member]
Restructuring Charges, Total		2,245,000
Closing of Midwest and Northwest Plants [Member] | Equipment Moves [Member]
Restructuring Charges, Total		$ 1,975,000

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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