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Note 16 - Employee Benefit Plans - Net Periodic Benefit Cost Recognized in Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 04, 2020	Sep. 29, 2019	Oct. 04, 2020	Sep. 29, 2019
Selling, general and administrative expenses	$ 1,000	$ 1,000	$ 3,000	$ 3,000
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	201,000	248,000	603,000	743,000
Total	202,000	249,000	606,000	746,000
Selling, General and Administrative Expenses [Member]
Selling, general and administrative expenses	$ 1,000	$ 1,000	$ 3,000	$ 3,000

X

- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

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-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

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X

- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
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-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

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X

- Details

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