Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Mar. 19, 2022	Dec. 25, 2021	Mar. 20, 2021
Receivables, allowance	$ 566	$ 457	$ 954
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)	13,585,096	13,493,332	13,924,754
Common stock, shares outstanding (in shares)	13,585,096	13,493,332	13,924,754