Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Weighted average common shares outstanding (in shares)	41,854	41,159	31,776
Effect of dilutive stock options and restricted stock units (in shares)	0	0	0
Weighted Average Number of Shares Outstanding, Diluted, Total	41,854	41,159	31,776