Stock Plans and Stock Compensation Expense (Stock Performance Units) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 25, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum market value (in dollars per share) | $ / shares	$ 5.00
Stock Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonemployee directors fees	$ 18
Value received in stock performance units	$ 18
Stock performance units, outstanding (in shares) | shares	130,320