Note 5 - Stock-based Compensation - Summary of Stock Option Activity (Details) - $ / shares	9 Months Ended
	Jun. 27, 2023	Jun. 28, 2022
Outstanding at beginning of year, shares (in shares)	470,161
Outstanding at beginning of year, weighted average exercise price (in dollars per share)	$ 3.97
Options granted, shares (in shares)	45,000	105,000
Options granted, weighted average exercise price (in dollars per share)	$ 2.81
Options exercised, shares (in shares)	(2,000)
Options exercised, weighted average exercise price (in dollars per share)	$ 2.31
Options Forfeited, shares (in shares)	(64,137)
Options Forfeited, weighted average exercise price (in dollars per share)	$ 3.43
Outstanding, shares (in shares)	449,024
Outstanding, weighted average exercise price (in dollars per share)	$ 3.94
Outstanding, weighted average remaining contractual life (Year)	5 years
Exercisable, shares (in shares)	334,103
Exercisable, weighted average exercise price (in dollars per share)	$ 3.66
Exercisable, weighted average remaining contractual life (Year)	4 years 7 months 6 days