Note 3 - Stock Based Compensation - Information Related to Stock Options (Details) - $ / shares	9 Months Ended
	Jun. 24, 2023	Mar. 25, 2023	Dec. 24, 2022	Sep. 24, 2022
Shares, outstanding (in shares)	149,900
Weghted average remaining contractual term (Year)	5 years 4 months 24 days
Weighted average exercise price (in dollars per share)	$ 3.48	$ 3.48	$ 3.45	$ 3.45
Exercisable, weighted average exercise price (in dollars per share)	$ 3.81
$2.01 - $3.00 (in shares)	119,800
Range 1 [Member]
Lower exercise price (in dollars per share)	$ 1.01
Higher exercise price (in dollars per share)	$ 2.00
Shares, outstanding (in shares)	40,000
Weghted average remaining contractual term (Year)	8 years 1 month 6 days
Weighted average exercise price (in dollars per share)	$ 1.79
Exercisable, weighted average exercise price (in dollars per share)	1.83
Range 2 [Member]
Lower exercise price (in dollars per share)	2.01
Higher exercise price (in dollars per share)	$ 3.00
Shares, outstanding (in shares)	34,300
Weghted average remaining contractual term (Year)	4 years 8 months 12 days
Weighted average exercise price (in dollars per share)	$ 2.61
Exercisable, weighted average exercise price (in dollars per share)	$ 2.63
$2.01 - $3.00 (in shares)	28,700
Range 3 [Member]
Lower exercise price (in dollars per share)	$ 3.01
Higher exercise price (in dollars per share)	$ 4.00
Shares, outstanding (in shares)	43,500
Weghted average remaining contractual term (Year)	5 years 9 months 18 days
Weighted average exercise price (in dollars per share)	$ 3.60
Exercisable, weighted average exercise price (in dollars per share)	$ 3.60
$2.01 - $3.00 (in shares)	41,400
Range 4 [Member]
Lower exercise price (in dollars per share)	$ 4.01
Higher exercise price (in dollars per share)	$ 5.00
Shares, outstanding (in shares)	9,600
Weghted average remaining contractual term (Year)	2 years
Weighted average exercise price (in dollars per share)	$ 4.09
Exercisable, weighted average exercise price (in dollars per share)	$ 4.09
$2.01 - $3.00 (in shares)	9,600
Range 5 [Member]
Lower exercise price (in dollars per share)	$ 5.01
Higher exercise price (in dollars per share)	$ 6.00
Shares, outstanding (in shares)	22,500
Weghted average remaining contractual term (Year)	2 years 6 months
Weighted average exercise price (in dollars per share)	$ 7.36
Exercisable, weighted average exercise price (in dollars per share)	$ 7.36
$2.01 - $3.00 (in shares)	22,500