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Note 11 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Options outstanding (in shares) 42,000  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.27  
Options granted (in shares) 0 0
Options granted, weighted average exercise price (in dollars per share)  
Options exercised (in shares) 0  
Options exercised, weighted average exercise price (in dollars per share)  
Options forfeited/cancelled (in shares) 0  
Options forfeited/cancelled, weighted average exercise price (in dollars per share)  
Options outstanding (in shares) 42,000  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.27  
Options outstanding lower limit exercise price (in dollars per share) 5.27  
Options outstanding upper limit exercise price (in dollars per share) $ 9.81  
Options exercisable (in shares) 27,000  
Options exercisable as of April 1, 2017 (in dollars per share)  
Intrinsic value per share of outstanding stock options $ 0