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Note 2 - Revenue (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 29, 2020	Mar. 29, 2020	Sep. 29, 2019
Contract with Customer, Liability, Current	$ 58,563,000	$ 58,563,000	$ 21,720,000
Contract with Customer, Liability, Revenue Recognized	4,460,000	17,858,000
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	0	0	1,107,000
Accounts Receivable, before Allowance for Credit Loss			47,863,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 7,661,000	$ 7,661,000	$ 6,434,000

X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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