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Note 11 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Options granted (in shares) 0 0
The 2007 Plan [Member]    
Options outstanding (in shares) 42,000  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.27  
Options granted (in shares) 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) (25,000)  
Options forfeited/cancelled, weighted average exercise price (in dollars per share)  
Options outstanding (in shares) 17,000  
Options outstanding, weighted average exercise price (in dollars per share) $ 6  
Options outstanding lower limit exercise price (in dollars per share) 5.27  
Options outstanding upper limit exercise price (in dollars per share) $ 6.10  
Options exercisable (in shares) 17,000  
Options exercisable as of September 30, 2017 (in dollars per share) $ 6  
Intrinsic value of outstanding stock options as of September 30, 2017 $ 1