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Note 4 - Summary of Stock Option Plan (Details)
 6 Months Ended
Jul. 02, 2016
$ / shares
shares
Outstanding, Number of Shares (in shares) | shares 574,851
Outstanding, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 8.30
Granted, Number of Shares (in shares) | shares 211,995
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 13.69
Exercised (in shares) | shares 23,311
Exercised (in dollars per share) | $ / shares $ 5.90
Outstanding, Number of Shares (in shares) | shares 763,535
Outstanding, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 9.87