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Stockholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
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Jun. 26, 2020 shares | Jun. 25, 2020 $ / shares | May 19, 2020 $ / shares shares | Apr. 19, 2020 USD ($) | Jun. 03, 2019 USD ($) $ / shares | Mar. 01, 2019 USD ($) $ / shares | Jun. 01, 2018 USD ($) $ / shares | Mar. 01, 2018 USD ($) $ / shares | Jun. 30, 2020 USD ($) director $ / shares shares | Jun. 30, 2019 USD ($) $ / shares | Jun. 30, 2020 USD ($) director $ / shares shares | Jun. 30, 2019 USD ($) $ / shares | Jun. 28, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash retainer, percentage change |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Quarterly Installment Of Annual Cash Retainer, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |
Share price at grant date | $ / shares |  | $ 18.02 | $ 15.79 |  |  |  |  |  |  |  |  |  |
Number Of Directors | director |  |  |  |  |  |  |  |  | 5 |  | 5 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  | $ 1,100,000 |  | $ 1,100,000 |  |
Directors compensation expense |  |  |  |  |  |  |  |  | $ 201,000 | $ 114,000 | $ 402,000 | $ 228,000 |
Dividends declared per common share (in dollars per Share) | $ / shares |  |  |  |  | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.150 | $ 0.150 |
Dividends |  |  |  |  | $ 1,343,000 | $ 1,339,000 | $ 1,365,000 | $ 1,360,000 |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage |  |  |  |  |  |  |  |  | 200.00% |  | 200.00% |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  | $ 25,600,000 |  | $ 25,600,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares |  |  |  |  |  |  |  |  | 43,314 |  |  |  |
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased | $ / shares |  |  |  |  |  |  |  |  | $ 14.39 |  |  |  |
Dividends declared per common share, increase (in dollars per Share) | $ / shares |  |  | $ 0.05 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  |  |  |  |  |  |  | 10,200 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | $ 80,000 | $ 61,000 | 244,000 | $ 166,000 |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 183,000 | 211,000 | $ 368,000 | 428,000 |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 4.61 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | $ 122,000 | 149,000 | $ 337,000 | 353,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  |  |  |  | 20,000 |  |
Share price at grant date | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 18.02 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares |  |  |  |  |  |  |  |  |  |  | 100,000 |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  | 368,921 |  |  |  |  |  | 13,974 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Canceled in Period | shares | 33,538 |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  | 54 months |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  | 1,700,000 |  | $ 1,700,000 |  |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  | 182,000 | $ 58,000 | $ 303,000 | $ 77,000 |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly installment of annual cash retainer |  |  |  | $ 29,750 |  |  |  |  | $ 35,000 |  |  |  |
Director |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  |  | 16,680 |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 17.08 |  |
Good to Great Incentive Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  |  |  |  | 17,991 |  |
Amended And Restated 2006 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cancelled shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 1,154,000 |  |

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