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Note 4 - Stock-based Compensation - Summary of Stock Option Plan (Details)
 9 Months Ended
Oct. 01, 2016
$ / shares
shares
Outstanding (in shares) | shares 574,851
Outstanding (in dollars per share) | $ / shares $ 8.30
Granted (in shares) | shares 211,995
Granted (in dollars per share) | $ / shares $ 13.69
Exercised (in shares) | shares 24,103
Exercised (in dollars per share) | $ / shares $ 5.92
Outstanding (in shares) | shares 762,743
Outstanding (in dollars per share) | $ / shares $ 9.88