Common Stock, Dividends, Per Share, Declared, Increase Authorized

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Pre tax compensation expense related to director fees, annual retainers, and deferred compensation amortization.

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- Definition

Weighted average purchase price of capital shares purchased through an employee stock purchase plan.

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Number Of Directors

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Quarterly Installment of Annual Cash Retainer

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Quarterly Installment Of Annual Cash Retainer, Percentage

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Quarterly Installment Of Annual Cash Retainer, Percentage Change

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Canceled in Period

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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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.

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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).

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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).

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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.

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No definition available.

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- Definition

Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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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.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Amount remaining of a stock repurchase plan authorized.

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Stockholders' Equity (Narrative) (Details)									3 Months Ended		6 Months Ended
Stockholders' Equity (Narrative) (Details)	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