Note 8 - Stock-based Compensation - Schedule of Stock Based Compensation Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
		Oct. 02, 2022		Jan. 02, 2022
Balance (in shares)		80,000	[1]	93,000
Weighted average price balance (in dollars per share)		$ 24.95	[1]	$ 27.49
Expired, options (in shares)		(13,000)
Weighted average price, expired (in dollars per share)		$ 42.90
Weighted average remaining, balance (Year)	[1]	2 years 10 months 6 days
Aggregate intrinsic value, balance	[1]	$ 0
Restricted Stock Units (RSUs) [Member]
RSUs granted (in shares)		(159)
RSUs forfeited or expired (in shares)		22
Balance (in shares)		568
Weighted average grant date fair value, balance (in dollars per share)		$ 5.86
RSUs granted (in shares)		159
Weighted average grant date fair value, granted (in dollars per share)		$ 6.11
RSUs vested (in shares)		(423)
Weighted average grant date fair value, vested (in dollars per share)		$ 5.98
RSUs forfeited or expired (in shares)		(22)
Weighted average grant date fair value, forfeited (in dollars per share)		$ 5.09
Balance (in shares)		282
Weighted average grant date fair value, balance (in dollars per share)		$ 5.92
Stock Plan 2019 [Member]
Balance (in shares)		1,369,000		594,000
Authorized (in shares)		912,000
RSUs granted (in shares)		(159,000)
RSUs forfeited or expired (in shares)		22,000
RSUs granted (in shares)		159,000
RSUs forfeited or expired (in shares)		(22,000)

[1] Exercisable and fully vested.