Note 5 - Stock-based Compensation - Non-vested Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	9 Months Ended
	Jun. 27, 2023	Jun. 28, 2022
Non-vested units at beginning of year, shares (in shares)	73,336
Units granted, shares (in shares)	25,750	28,000
Units granted, grant date fair value per share (in dollars per share)	$ 2.29
Units vested, shares (in shares)	(46,336)
Units vested, grant date fair value per share (in dollars per share)	$ 1.54
Units forfeited, shares (in shares)	(2,750)
Non-vested units, shares (in shares)	50,000
Minimum [Member]
Non-vested units at beginning of year, grant date fair value per share (in dollars per share)	$ 1.54
Units forfeited, grant date fair value per share (in dollars per share)	2.29
Non-vested units, grant date fair value per share (in dollars per share)	2.29
Maximum [Member]
Non-vested units at beginning of year, grant date fair value per share (in dollars per share)	4.50
Units forfeited, grant date fair value per share (in dollars per share)	4.50
Non-vested units, grant date fair value per share (in dollars per share)	$ 4.50