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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 01, 2020 $ / shares | Feb. 19, 2020 USD ($) shares | Mar. 01, 2019 $ / shares | Jun. 30, 2021 | Mar. 31, 2021 USD ($) director $ / shares shares | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  | 1.15% |  |  |  |
Number Of Directors | director |  |  |  |  | 6 |  |  |  |
Directors compensation expense |  |  |  |  | $ 231 |  |  | $ 201 |
Dividends declared per common share (in dollars per Share) | $ / shares | $ 0.100 |  | $ 0.075 |  | $ 0.1000 |  |  | $ 0.075 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  | $ 25,600 |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares |  |  |  |  | 18,182 |  |  | 26,294 |
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in USD per share) | $ / shares |  |  |  |  | $ 26.32 |  |  | $ 13.73 |
Expected holding period (years) |  |  |  |  | 5 years |  |  |  |
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 |  |  |  |  | 9,300 |  |  | 10,200 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  | $ 324 |  |  | $ 255 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 34.79 |  |  | $ 25.00 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years |  |  |  |
ESPP |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  | 0.01% |  |  |  |
Share-based compensation expense |  |  |  |  | $ 206 |  |  | $ 163 |
Expected volatility |  |  |  |  | 48.14% |  |  |  |
Risk-free interest rate |  |  |  |  | 0.10% | 0.09% | 0.09% |  |
Expected holding period (years) |  |  |  |  | 9 months | 6 months | 3 months |  |
ESPP | Forecast |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  |  | 0.10% |  |  |  |  |
Expected holding period (years) |  |  |  | 1 year |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 121 |  |  | 184 |
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 |  |  |  |  | 33.00% |  |  |  |
Share-based compensation expense |  |  |  |  | $ 560 |  |  | $ 215 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 5 years |  |  |  |
Stock Options | Monte-Carlo Pricing Model |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 150,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  | $ 1,700 |  |  |  |
Share price at grant date | $ / shares |  |  |  |  | $ 34.79 |  |  |  |
Stock Options | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 10 years |  |  |  |
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 |  |  | 27,948 |  |  |  | 368,921
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  | $ 2,800 |  |  |  |  |  |  |
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 |  |  |  |  | 5,040 |  |  | 8,821 |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  | $ 177 |  |  | $ 147 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 35.19 |  |  | $ 16.15 |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  | $ 237 |  |  | $ 121 |

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