Note 5 - Share-based Compensation Plans - Stock Option Activity (Details) - The 2020 Equity Incentive Plan [Member]	12 Months Ended
	Dec. 30, 2023 USD ($) $ / shares shares
Outstanding, shares (in shares) | shares	961,400
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.47
Granted (in shares) | shares	344,500
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 2.9
Exercised, shares (in shares) | shares	(141,000)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 1.78
Forfeited, shares (in shares) | shares	(236,400)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 2.93
Expired, shares (in shares) | shares	(25,000)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 1
Outstanding, shares (in shares) | shares	903,500
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 2.66
Outstanding, weighted remaining contractual life (Year)	6 years 6 months 3 days
Outstanding, Aggregate intrinsic value | $	$ 2,403,762
Options exercisable, shares (in shares) | shares	494,600
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 2.42
Options exercisable, weighted remaining contractual life (Year)	4 years 6 months 29 days
Options exercisable, Aggregate intrinsic value | $	$ 1,199,158