Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Oct. 02, 2021	Dec. 26, 2020	Oct. 03, 2020
Receivables, allowance	$ 636	$ 896	$ 798
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000
Preferred stock, par value (in dollars per share)	$ 0	$ 0	$ 0
Preferred stock, shares issued (in shares)	0	0	0
Common stock, shares authorized (in shares)	30,000,000	30,000,000	30,000,000
Common stock, par value (in dollars per share)	$ 0	$ 0	$ 0
Common stock, shares issued (in shares)	13,557,879	13,919,380	14,169,404
Common stock, shares outstanding (in shares)	13,557,879	13,919,380	14,169,404