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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Apr. 01, 2022 | Jun. 01, 2020 | Mar. 01, 2020 | Jun. 03, 2019 | Mar. 01, 2019 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jul. 26, 2021 | May 18, 2021
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, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  | $ 25.88 |  |  |
Directors compensation expense |  |  |  |  |  |  | $ 184,000 |  |  | $ 219,000 | $ 385,000 | $ 455,000 |  |
Dividends declared per common share (in dollars per Share) |  | $ 0.1125 | $ 0.1125 | $ 0.1000 | $ 0.1000 |  | $ 0.1125 |  |  | $ 0.100 | $ 0.225 | $ 0.200 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  |  |  | 11,796 |  |  | 13,706 | 25,089 | 31,888 |  |
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in USD per share) |  |  |  |  |  |  | $ 33.70 |  |  | $ 26.32 | $ 39.86 | $ 26.32 |  |
Treasury stock acquired (in shares) |  |  |  |  |  |  | 205,496 |  |  | 324,700 | 695,496 | 324,700 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  | $ 8,224,000 |  |  | $ 12,301,000 | $ 34,234,000 | $ 12,301,000 |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  | $ 40.02 |  |  | $ 37.88 | $ 49.22 | $ 37.88 |  |
Shares settled (in shares) |  |  |  |  |  |  | 24,700 |  |  |  | 24,700 |  |  |
Treasury stock settled |  |  |  |  |  |  | $ 700,000 |  |  |  | $ 700,000 |  |  |
Additional authorized amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 75,000,000
Additional authorized amount |  |  |  |  |  |  | $ 48,900,000 |  |  |  | $ 48,900,000 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 0 | 0 | 9,300 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 324,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  | $ 34.79 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited |  |  |  |  |  |  | 450 |  |  | 966 | 1,450 | 966 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  |  |  | (49) |  |  | 0 | 4,136 | 9,688 |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  | $ (2,000) |  |  | $ 0 | $ 205,000 | $ 347,000 |  |
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  | 0.01% |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 152,000 |  |  | 135,000 | $ 351,000 | 341,000 |  |
Expected volatility |  |  |  |  |  |  |  |  |  |  | 30.24% |  |  |
Risk-free interest rate |  |  |  |  |  |  | 0.31% | 0.22% | 0.08% |  |  |  |  |
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 |  |  |  |  |  | 0.40% |  |  |  |  |  |  |  |
Expected holding period (years) |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 40,000 |  |  | 98,000 | $ 97,000 | 219,000 |  |
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 |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |
Share-based compensation expense |  |  |  |  |  |  | 550,000 |  |  | 480,000 | $ 1,188,000 | 1,040,000 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  | 0 |  |  | 733,000 | 60,000 | 879,000 |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  | $ 0 |  |  | $ 681,000 | $ 82,000 | $ 976,000 |  |
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 |  |  |  |  |  |  | 0 |  |  | 0 | 0 | 150,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 0 | $ 1,684,000 |  |
Share price at grant date |  |  |  |  |  |  |  |  |  |  | $ 49.48 | $ 34.79 |  |
Performance awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 23,263 |  |  | 0 | 27,013 | 10,254 |  |
Expected volatility | 44.44% |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate | 2.55% |  |  |  |  |  |  |  |  |  |  |  |  |
Expected holding period (years) | 2 years 9 months |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  |  |  | $ 1,100,000 |  |  | $ 0 | $ 1,262,000 | $ 402,000 |  |
Share price at grant date | $ 52.49 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 2,372 |  |  | 4,333 | 5,041 | 9,373 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  | $ 94,000 |  |  | $ 160,000 | $ 236,000 | $ 338,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  |  |  |  |  |  | $ 39.65 |  |  | $ 36.97 | $ 46.83 | $ 36.01 |  |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  | $ 637,000 |  |  | $ 352,000 | $ 1,203,000 | $ 589,000 |  |
Advsior |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 126 |  |  | 135 | 219 | 277 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  | $ 5,000 |  |  | $ 5,000 | $ 10,000 | $ 10,000 |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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