Condensed Consolidated Balance Sheets (Current Period Unuadited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 30, 2016
Trade accounts receivable, allowance for doubtful accounts	$ 225	$ 10
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	10,489,091	10,319,627
Common stock, shares outstanding (in shares)	10,489,091	10,319,627