Note 10 - Stock-Based Compensation Plans - Assumptions Used at Grant Date In the Valuation of RUSs (Details)	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Weighted average expected volatility		31.60%
Weighted average risk-free interest rate		2.51%
Expected term (years), minimum (Year)		6 years	4 years 29 days
Restricted Stock Units (RSUs) [Member]
Weighted average expected volatility	42.38%
Weighted average risk-free interest rate	1.40%
Expected term (years), minimum (Year)	3 years	3 years
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Weighted average expected volatility	40.15%		41.06%
Weighted average risk-free interest rate	1.66%		2.71%
Expected term (years), minimum (Year)			3 years
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Weighted average expected volatility		41.10%	41.74%
Weighted average risk-free interest rate		2.55%	2.87%
Expected term (years), minimum (Year)			3 years 1 month 28 days