Note 13 - Stock-based Compensation (Details Textual) - USD ($)	12 Months Ended
Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Payment Arrangement, Amount Capitalized	$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0
Share Price (in dollars per share)	$ 5.11
Share-based Payment Arrangement, Expense	$ 2,526,000	$ 1,739,000	$ 3,144,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	0	0
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)	$ 2.18	$ 1.09	$ 4.28
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	83,605	20,409	24,131
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 3.14	$ 2.47	$ 9.76
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	258,343
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 110,000	$ 39,000	$ 60,000
Share-based Payment Arrangement, Option [Member]
Proceeds from Stock Options Exercised	0	0	3,600
Share-based Payment Arrangement, Expense	$ 0	39,000	60,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Expense	$ 2,400,000	$ 1,700,000	$ 3,000,000.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)	$ 5.86	$ 4.99	$ 12.55	$ 17.22
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	619,000	816,000	353,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 5.81	$ 3.97	$ 10.77

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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