Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 25, 2022	Dec. 25, 2021	[1]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	49,152,000	48,756,000
Common stock, shares outstanding (in shares)	49,152,000	48,756,000
Treasury stock, shares (in shares)	924,000	207,000

[1] Derived from December 25, 2021 audited financial statements