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Note 7 - Plant Restructuring (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Restructuring Charges, Total	$ 1,912,000	$ 72,000
Employee Severance [Member]
Restructuring Charges, Total	1,763,000	36,000
Other Restructuring [Member]
Restructuring Charges, Total	149,000	36,000
Closing of West and Northwest Plants [Member]
Restructuring Charges, Total	1,820,000
Closing of West and Northwest Plants [Member] | Employee Severance [Member]
Restructuring Charges, Total	1,763,000
Closing of West and Northwest Plants [Member] | Other Restructuring [Member]
Restructuring Charges, Total	149,000
Closing of West and Northwest Plants [Member] | Asset Impairment Correction [Member]
Restructuring Reserve, Accrual Adjustment	$ (92,000)
Closing of Northwest Plant [Member]
Restructuring Charges, Total		81,000
Closing of Northwest Plant [Member] | Employee Severance [Member]
Restructuring Charges, Total		36,000
Closing of Northwest Plant [Member] | Other Restructuring [Member]
Restructuring Charges, Total		36,000
Closing of Northwest Plant [Member] | Impairment of Long-Lived Assets [Member]
Restructuring Charges, Total		$ 9,000

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
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

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X

- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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