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Note 4 - Stock-based Compensation - Summary of Stock Option Plan (Details)
 3 Months Ended
Apr. 01, 2017
$ / shares
shares
Outstanding, number of shares (in shares) | shares 757,784
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 9.91
Granted, number of shares (in shares) | shares 72,051
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 8.85
Exercised, number of shares (in shares) | shares 769
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 6.21
Forfeited, number of shares (in shares) | shares 23,549
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 13.49
Canceled or expired, number of shares (in shares) | shares
Canceled or expired, weighted average exercise price (in dollars per share) | $ / shares
Outstanding, number of shares (in shares) | shares 805,517
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 9.71