Note 11 - Share-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jul. 01, 2017	Jul. 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)	42,000
Options exercisable as of July 1, 2017 (in dollars per share)
Intrinsic value per share of outstanding stock options	$ 0