Note 12 - Restructuring Activity - Restructuring Activity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 29, 2018	Sep. 29, 2017
Balance at beginning of period	$ 2,582	$ 3,160
Additions:
Additions to restructuring reserve	410	561
Reductions:
Reductions to restructuring reserve	(850)	(1,139)
Balance at end of period	2,142	2,582
RTC Cease-Use Charge [Member] | Facility Closing [Member]
Additions:
Additions to restructuring reserve	104	386
Lease Amending Agreement Surrender Agreement [Member] | Contract Termination [Member]
Additions:
Additions to restructuring reserve	160	0
Reductions:
Reductions to restructuring reserve	(160)	0
Accretion Expense 1 [Member] | Facility Closing [Member]
Additions:
Additions to restructuring reserve	146	175
Rent Payments [Member] | Facility Closing [Member]
Reductions:
Reductions to restructuring reserve	$ (690)	$ (1,139)