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Note 8 - Shareholders' Equity - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 25, 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 346,000
Options granted - weighted average exercise price (in dollars per share) | $ / shares $ 4.71
Options exercised (in shares) | shares (47,642)
Options exercised - weighted average exercise price (in dollars per share) | $ / shares $ 3.81
Options forfeited or expired (in shares) | shares (64,651)
Options forfeited or expired - weighted average exercise price (in dollars per share) | $ / shares $ 8.02
Options outstanding (in shares) | shares 2,491,676
Options outstanding - weighted average exercise price (in dollars per share) | $ / shares $ 6.08
Options outstanding - weighted average remaining contractual term 3 years 167 days
Options outstanding - aggregate intrinsic value | $ $ 246
Options vested and expected to vest (in shares) | shares 2,347,190
Options vested and expected to vest - weighted average exercise price (in dollars per share) | $ / shares $ 6.17
Options vested and expected to vest - weighted average remaining contractual term 3 years 94 days
Options vested and expected to vest - aggregate intrinsic value | $ $ 226
Options exercisable (in shares) | shares 1,392,204
Options exercisable - weighted average exercise price (in dollars per share) | $ / shares $ 4.90
Options exercisable - weighted average remaining contractual term 2 years 62 days
Options exercisable - aggregate intrinsic value | $ $ 168