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Stockholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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Oct. 27, 2020 $ / shares | Sep. 01, 2020 $ / shares | Aug. 31, 2020 shares | Jun. 30, 2020 shares | Jun. 26, 2020 shares | Jun. 25, 2020 shares | Jun. 01, 2020 $ / shares | May 19, 2020 $ / shares shares | Apr. 19, 2020 USD ($) | Mar. 01, 2020 $ / shares | Feb. 19, 2020 USD ($) | Sep. 01, 2019 $ / shares | Jun. 03, 2019 $ / shares | Mar. 01, 2019 $ / shares | Dec. 31, 2020 | Sep. 30, 2020 USD ($) director $ / shares shares | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2020 USD ($) director $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 28, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.67% |  |
Quarterly installment of annual cash retainer |  |  |  |  |  |  |  |  | $ 29,750 |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |
Cash retainer, percentage change |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 2 months 12 days |  |
Number Of Directors | director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  | 6 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  | $ 1,100,000 |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000 |  |  | $ 114,000 | $ 653,000 | $ 341,000 |
Dividends declared per common share (in dollars per Share) | $ / shares |  | $ 0.0875 |  |  |  |  | $ 0.0750 |  |  | $ 0.0750 |  | $ 0.0750 | $ 0.0750 | $ 0.0750 |  | $ 0.0875 |  |  | $ 0.075 | $ 0.2375 | $ 0.225 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,600,000 |  |  |  | $ 25,600,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,706 |  |  |  | 59,020 |  |
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.96 |  |  |  | $ 15.6 |  |
Dividends declared per common share, increase (in dollars per Share) | $ / shares |  |  |  |  |  |  |  | $ 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.54% |  |
Quarterly Installment Of Annual Cash Retainer, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |
Expected holding period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 8 months 26 days |  |
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 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 95,000 |  |  | $ 58,000 | $ 339,000 | $ 224,000 |
Expected volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.63% |  |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.57% | 1.57% | 1.54% |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.56% |  |  |  |  |  |  |
Expected holding period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 183,000 |  |  | 196,000 | $ 551,000 | 624,000 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 165,000 |  |  | 160,000 | $ 502,000 | 513,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
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 |  |  | 6,987 | 2,795 |  | 13,974 |  | 368,921 |  |  |  |  |  |  |  |  |  |  |  | 368,921 |  |
Expected volatility |  |  | 37.71% | 37.43% |  | 36.24% |  | 34.54% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares |  |  |  |  | 33,538 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  | 0.24% | 0.20% |  | 0.29% |  | 0.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected holding period (years) |  |  | 4 years 3 months 29 days | 4 years 5 months 1 day |  | 4 years 6 months 7 days |  | 4 years 7 months 13 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,540 |  |  |  | 25,220 |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  | $ 500,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22.41 |  |  |  | $ 18.88 |  |
Officers And Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 286,000 |  |  | $ 61,000 | $ 589,000 | $ 138,000 |
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 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share, increase (in dollars per Share) | $ / shares | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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