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Note 8 - Shareholders' Equity - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 26, 2016
USD ($)
$ / shares
shares
Options outstanding (in shares) | shares 2,257,969
Options outstanding - weighted average exercise price (in dollars per share) | $ / shares $ 6.30
Options granted (in shares) | shares 348,500
Options granted - weighted average exercise price (in dollars per share) | $ / shares $ 4.71
Options exercised (in shares) | shares (19,741)
Options exercised - weighted average exercise price (in dollars per share) | $ / shares $ 3.82
Options forfeited or expired (in shares) | shares (46,069)
Options forfeited or expired - weighted average exercise price (in dollars per share) | $ / shares $ 9.54
Options outstanding ( (in shares) | shares 2,540,659
Options outstanding - weighted average exercise price (in dollars per share) | $ / shares $ 6.04
Options outstanding - weighted average remaining contractual term (years) 3 years 262 days
Options outstanding - aggregate intrinsic value | $ $ 1,171
Options vested and expected to vest (in shares) | shares 2,371,248
Options vested and expected to vest - weighted average exercise price (in dollars per share) | $ / shares $ 6.14
Options vested and expected to vest - weighted average remaining contractual term (years) 3 years 189 days
Options vested and expected to vest - aggregate intrinsic value | $ $ 1,063
Options exercisable (in shares) | shares 1,391,598
Options exercisable - weighted average exercise price (in dollars per share) | $ / shares $ 4.89
Options exercisable - weighted average remaining contractual term (years) 2 years 142 days
Options exercisable - aggregate intrinsic value | $ $ 724