Stock-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) plan $ / shares shares	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans \| plan	3
Number of equity compensation plans available for future grants \| plan	2
Shareholder, percent	10.00%
Unrecognized compensation cost related to share-based payments \| $		$ 1.1
Unrecognized compensation cost related to share-based payments, period for recognition		2 years 18 days
Options granted, shares (in shares)	186,900
NonPrincipal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, exercise price as percent of weighted-average grant date fair value	100.00%
Long-Term Incentive Compensation Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under equity compensation plans	2,400,000
Directors’ Incentive Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under equity compensation plans	250,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Weighted average exercise price (in dollars per share) \| $ / shares	$ 3.17
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 1.52
Expected term	7 years
Dividend yield \| $	$ 0.0
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	31.00%
Weighted average volatility rate	36.00%
Risk free interest rate	1.27%
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	43.00%
Weighted average volatility rate	38.00%
Risk free interest rate	1.44%
Stock Options \| Principal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expiration period	5 years
Stock Options \| NonPrincipal Owner \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, expiration period	10 years
Restricted Stock \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Available for Future Grants

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Price as Percent of Weighted Average Grant Date Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Shareholder, Percent

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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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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.

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- Definition

The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 50
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