Consolidated Condensed Balance Sheets (Current Period Unaudited)-parentheticals (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Oct. 01, 2022	Dec. 25, 2021	Oct. 02, 2021
Receivables, allowance	$ 729	$ 457	$ 636
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000
Preferred Stock, Par or Stated Value Per Share (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, No Par Value (in dollars per share)	$ 0	$ 0	$ 0
Common Stock, Shares, Issued (in shares)	13,590,407	13,493,332	13,557,879
Common stock, shares outstanding (in shares)	13,590,407	13,493,332	13,557,879