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Note 4 - Stock-based Compensation - Summary of Stock Option Plan (Details)
 6 Months Ended
Jul. 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 1,269
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 6.36
Forfeited, number of shares (in shares) | shares 26,795
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 13.45
Canceled or expired, number of shares (in shares) | shares 8,320
Canceled or expired, weighted average exercise price (in dollars per share) | $ / shares $ 11.27
Outstanding, number of shares (in shares) | shares 793,451
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 9.69