Note 13 - Stock-Based Compensation - Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range (Details)	12 Months Ended
	Jan. 02, 2022 $ / shares shares
Range 1 [Member]
Options outstanding (in shares)	48
Weighted average remaining contractual life (Year)	4 years 8 months 4 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 12,050.00
Options exercisable (in shares)	48
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 12,050.00
Range 2 [Member]
Options outstanding (in shares)	3
Weighted average remaining contractual life (Year)	7 months 6 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 30,380
Options exercisable (in shares)	3
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 30,380
Range 3 [Member]
Options outstanding (in shares)	5
Weighted average remaining contractual life (Year)	10 months 6 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 31,500
Options exercisable (in shares)	5
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 31,500
Range 4 [Member]
Options outstanding (in shares)	3
Weighted average remaining contractual life (Year)	1 year 4 months 6 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 32,200
Options exercisable (in shares)	3
Range 5 [Member]
Options outstanding (in shares)	0.4
Weighted average remaining contractual life (Year)	9 months 21 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 40,180
Options exercisable (in shares)	0.4
Range 6 [Member]
Options outstanding (in shares)	6
Weighted average remaining contractual life (Year)	2 years 11 months 15 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 44,800
Options exercisable (in shares)	6
Range 7 [Member]
Options outstanding (in shares)	3
Weighted average remaining contractual life (Year)	2 years 4 months 6 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 46,620
Options exercisable (in shares)	3
Range 8 [Member]
Options outstanding (in shares)	13
Weighted average remaining contractual life (Year)	1 year 11 months 8 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 47,460
Options exercisable (in shares)	13
Range 9 [Member]
Options outstanding (in shares)	8
Weighted average remaining contractual life (Year)	4 months 6 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 48,720
Options exercisable (in shares)	8
Range 10 [Member]
Options outstanding (in shares)	4
Weighted average remaining contractual life (Year)	2 years 4 months 17 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 53,480
Options exercisable (in shares)	4
Range 11 [Member]
Options outstanding (in shares)	93
Weighted average remaining contractual life (Year)	3 years 2 months 8 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 27,490
Options exercisable (in shares)	93