Note 1 - Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Weighted average common shares (in shares)	41,844	41,125	41,673	40,999
Effect of dilutive securities (in shares)	0	0	0	0
Weighted Average Number of Shares Outstanding, Diluted, Total	41,844	41,125	41,673	40,999