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Note 6 - Stock-based Compensation - Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Nov. 28, 2021
USD ($)
$ / shares
shares
Feb. 28, 2021
USD ($)
Outstanding options (in shares) | shares 634,534  
Balance, weighted average exercise price (in dollars per share) | $ / shares $ 12.47  
Outstanding aggregate intrinsic value | $ $ 32 $ 343
Outstanding options, granted (in shares) | shares 142,250  
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 13.85  
Outstanding options, exercised (in shares) | shares (75,334)  
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 9.81  
Outstanding options, terminated or expired (in shares) | shares (58,150)  
Terminated or expired, weighted average exercise price (in dollars per share) | $ / shares $ 13.96  
Outstanding options (in shares) | shares 643,300  
Balance, weighted average exercise price (in dollars per share) | $ / shares $ 12.96  
Balance, weighted average remaining contractual term (Year) 5 years 7 months 6 days  
Outstanding options, vested and exercisable (in shares) | shares 391,275  
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 12.47  
Vested and exercisable, weighted average remaining contractual term (Year) 3 years 6 months 25 days  
Vested and exercisable, aggregate intrinsic value | $ $ 211