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Stock-Based Compensation (Details Textual) |  | 12 Months Ended
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Jun. 01, 2015 shares | Jan. 02, 2021 USD ($) $ / shares shares | Jan. 02, 2021 GBP (£) shares | Dec. 28, 2019 USD ($) $ / shares shares | Dec. 29, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance |  | 23,000 |  |  |
Fair value of RSUs/restricted stock granted | $ |  | $ 6,843,000 |  | $ 5,079,000 | $ 5,947,000
Recognized weighted average period (in years) |  | 2 years 3 months 18 days | 2 years 3 months 18 days |  |
Contractual term of stock options |  | 10 years | 10 years |  |
Unrecognized compensation cost related to the stock options | $ |  | $ 133,000 |  |  |
2012 Nonemployee Director Fees Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Aggregate number of shares authorized for grant |  | 270,000 |  |  |
Shares available for issuance |  | 71,549 |  |  |
Common stock shares for each nonemployee director | 250 |  |  |  |
Fee for the chairs of each Board committee | 150.00% |  |  |  |
Annual retainer of common stock received by non employee directors |  | 2,000 | 2,000 |  |
Stock option granted, shares |  | 26,675 | 26,675 | 25,200 |
Share-based compensation expenses under Director's plan | $ |  | $ 1,178,000 |  | $ 1,162,000 | 1,213,000
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Aggregate number of shares authorized for grant |  | 1,096,875 |  |  |
Rate of common stock at market value |  | 85.00% | 85.00% |  |
Employee Stock Purchase Plan and U.K. Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance |  | 411,629 |  |  |
Number of shares purchased by employees |  | 43,574 | 43,574 | 49,195 |
Weighted average price | $ / shares |  | $ 30.86 |  | $ 33.55 |
Share-based compensation expenses | $ |  | $ 431,000 |  | $ 551,000 | 324,000
Minimum [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Allowable employees purchase rate of common stock based on annual salary |  | 10.00% | 10.00% |  |
Minimum [Member] | Employee Stock Purchase Plan [Member] | United States [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares allowed to be purchased by employees | $ |  | $ 25,000 |  |  |
Minimum [Member] | Employee Stock Purchase Plan [Member] | United Kingdom [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares allowed to be purchased by employees | £ |  |  | £ 1,500 |  |
Maximum [Member] | 2012 Nonemployee Director Fees Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Maximum number of share issuable to non employee directors per year |  | 35,000 |  |  |
2019 Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance |  | 968,666 |  |  |
Time Based [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years | 3 years |  |
Performance Based [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years | 3 years |  |
RSUs [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Target amount percentage |  | 0.00% | 0.00% |  |
RSUs [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Target amount percentage |  | 200.00% | 200.00% |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Compensation expense | $ |  | $ 4,182,000 |  | $ 3,465,000 | $ 2,728,000
Total unrecognized compensation | $ |  | $ 5,444,000 |  |  |
Recognized weighted average period (in years) |  | 1 year 8 months 12 days | 1 year 8 months 12 days |  |

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