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Note 8 - Shareholders' Equity - Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 27, 2016
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options outstanding | shares 2,257,969
Options granted | shares 75,000
Options exercised | shares (4,084)
Options forfeited or expired | shares (34,905)
Options outstanding | shares 2,293,980
Options vested and expected to vest | shares 2,146,741
Options Exercisable | shares 1,395,423
Options outstanding - weighted average exercise price | $ / shares $ 6.30
Options granted - weighted average exercise price | $ / shares 6.24
Options exercised - weighted average exercise price | $ / shares 3.51
Options forfeited or expired - weighted average exercise price | $ / shares 11.38
Options outstanding - weighted average exercise price | $ / shares 6.22
Options vested and expected to vest - weighted average exercise price | $ / shares 6.31
Options exercisable - weighted average exercise price | $ / shares $ 4.89
Options outstanding - weighted average remaining contractual term (years) 3 years 6 months 7 days
Options vested and expected to vest - weighted average remaining contractual term (years) 3 years 3 months 29 days
Options exercisable - weighted average remaining contractual term (years) 2 years 10 months 6 days
Options outstanding - aggregate intrinsic value | $ $ 1,225
Options vested and expected to vest - aggregate intrinsic value | $ 1,144
Options exercisable - aggregate intrinsic value | $ $ 891