Note 10 - Per Share Data - Weighted Average Number of Common Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Basic weighted average shares outstanding (in shares)	11,141,518	12,621,593	11,340,453	12,866,571
Dilutive effect of outstanding restricted share units (in shares)	390,804	0	410,893	0
Weighted average dilutive shares outstanding (in shares)	11,532,322	12,621,593	11,751,346	12,866,571