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Stockholders' Equity (Narrative) (Details) |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 01, 2019 USD ($) $ / shares | Mar. 01, 2018 USD ($) $ / shares | Mar. 31, 2020 USD ($) director $ / shares shares | Mar. 31, 2019 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 1 year 8 months |
Number Of Directors | director |  |  | 5 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | $ 1,100,000 |
Directors compensation expense |  |  | $ 201,000 | $ 114,000
Dividends declared per common share (in dollars per Share) | $ / shares | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075
Dividends | $ 1,339,000 | $ 1,360,000 |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage |  |  | 200.00% |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 25,600,000 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares |  |  | 26,294 |
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased | $ / shares |  |  | $ 13.73 |
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 |  |  | $ 163,000 | $ 105,000
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  |  | $ 184,000 | 217,000
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 20.00% |
Share-based compensation expense |  |  | $ 215,000 | 204,000
Performance Shares [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 |  |  | 237,500 |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  | $ 2,800,000 |
Officers And Key Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Directors compensation expense |  |  | 121,000 | $ 19,000
Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Quarterly installment of annual cash retainer |  |  | $ 35,000 |
Director [Member] |  |  |  |
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 |  |  | 8,821 |
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, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 16.15 |
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 |  |  | $ 449,000 |
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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