Note 2 - Contract Liability (Unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Beginning Balance	$ 1,094	$ 1,923	$ 1,334	$ 1,865
Additions to contract liability	1,474	1,337	2,749	3,028
Amounts recognized as revenue	(1,333)	(1,605)	(2,848)	(3,238)
Ending Balance	$ 1,235	$ 1,655	$ 1,235	$ 1,655