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Note 9 - Plant Restructuring (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017
Closing of East and Northwest Plants [Member]
Restructuring Charges, Total	$ 845,000
Closing of East and Northwest Plants [Member] | Employee Severance [Member]
Restructuring Charges, Total	841,000
Closing of East and Northwest Plants [Member] | Other Restructuring [Member]
Restructuring Charges, Total	$ 4,000
Closing of Northwest Plant [Member]
Restructuring Charges, Total		$ 38,000	$ 56,000
Closing of Northwest Plant [Member] | Employee Severance [Member]
Restructuring Charges, Total		110,000	$ 36,000
Closing of Northwest Plant [Member] | Other Restructuring [Member]
Restructuring Charges, Total		20,000
Closing of Northwest Plant [Member] | Asset Impairment Correction [Member]
Restructuring Reserve, Accrual Adjustment		$ (92,000)

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

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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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

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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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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Subparagraph (SAB TOPIC 5.P.4(b)(2))
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