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Note 5 - Share-based Compensation Plans - Stock Option Activity (Details) - The 2020 Equity Incentive Plan [Member] - USD ($)
 12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Outstanding, shares (in shares) 1,251,500  
Outstanding, weighted average exercise price (in dollars per share) $ 1.82  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 258,000 119,000
Granted, weighted average exercise price (in dollars per share) $ 3.39  
Exercised, shares (in shares) (630,400) (318,250)
Exercised, weighted average exercise price (in dollars per share) $ 1.97  
Forfeited, shares (in shares) (36,700)  
Forfeited, weighted average exercise price (in dollars per share) $ 1.69  
Expired, shares (in shares) (3,000)  
Expired, weighted average exercise price (in dollars per share) $ 1.49  
Outstanding, shares (in shares) 839,400 1,251,500
Outstanding, weighted average exercise price (in dollars per share) $ 2.20 $ 1.82
Outstanding, weighted remaining contractual life (Year) 6 years 1 month 28 days  
Outstanding, Aggregate intrinsic value $ 1,874,111  
Options exercisable, shares (in shares) 468,900  
Options exercisable, weighted average exercise price (in dollars per share) $ 1.90  
Options exercisable, weighted remaining contractual life (Year) 4 years 5 months 4 days  
Options exercisable, Aggregate intrinsic value $ 1,163,055