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Stockholders' Equity (Narrative) (Details) |  |  |  | 3 Months Ended | 12 Months Ended
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Feb. 20, 2019 | Mar. 01, 2018 USD ($) $ / shares | Mar. 01, 2017 USD ($) $ / shares | Mar. 31, 2019 USD ($) director $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value | $ |  |  |  | $ 39,000 |  |
Shares Reserved (in shares) | shares |  |  |  | 2,455,000 |  |
Shares Available to Issue (in shares) | shares |  |  |  | 1,642,000 |  |
Options Outstanding (in shares) | shares |  |  |  | 1,146,000 |  |
Performance Awards Outstanding (in shares) | shares |  |  |  | 497,000 |  |
Weighted aerage grant date fair value (in usd per share) | $ / shares |  |  |  | $ 19.25 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  | 2,012 |  |
Number Of Directors | director |  |  |  | 2 |  |
Directors compensation expense | $ |  |  |  | $ 114,000 | $ 84,000 |
Dividends declared per common share (in dollars per Share) | $ / shares |  | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 |
Dividends | $ |  | $ 1,400,000 | $ 1,200,000 |  |  |
Risk-free interest rate |  |  |  | 2.42% |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage |  |  |  | 200.00% |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ |  |  |  | $ 2,000,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 2 months 18 days |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  |  |  | $ 8,300,000 |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares purchased through Employee Stock Purchase Plan (in Shares) | shares |  |  |  | 20,796 |  |
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share) | $ / shares |  |  |  | $ 13.18 |  |
Share-based compensation expense | $ |  |  |  | $ 105,000 | $ 97,000 |
Expected volatility |  |  |  | 36.13% |  |
Expected holding period (years) |  |  |  | 3 months |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 217,000 | 245,000 |
Stock Granted, Value, Share-based Compensation, Net of Forfeitures | $ |  |  |  | $ 500,000 |  |
Weighted aerage grant date fair value (in usd per share) | $ / shares |  |  |  | $ 19.94 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  |  | 25,550 |  |
Restricted Stock | 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 |  |  |  | 3 years |  |
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 |  |  |  | 20.00% |  |
Share-based compensation expense | $ |  |  |  | $ 204,000 | 480,000 |
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 |  |  |  | 248,500 |  |
Expected volatility | 25.70% |  |  |  |  |
Risk-free interest rate | 2.47% |  |  |  |  |
Expected holding period (years) | 4 years 10 months 10 days |  |  |  |  |
Officers And Key Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Directors compensation expense | $ |  |  |  | $ 19,000 | 276,000 |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value | $ |  |  |  | 1,100,000 |  |
Board of Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Quarterly Installment Of Annual Cash Retainer | $ |  |  |  |  |  | $ 18,750
Annual Cash Retainer | $ |  |  |  |  |  | 75,000
Director [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Quarterly Installment Of Annual Cash Retainer | $ |  |  |  |  |  | 2,500
Annual Cash Retainer | $ |  |  |  |  |  | 10,000
Corporate Governance Committee Chairman [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Quarterly Installment Of Annual Cash Retainer | $ |  |  |  |  |  | 1,250
Annual Cash Retainer | $ |  |  |  |  |  | $ 5,000
Good to Great Incentive Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock Granted, Value, Share-based Compensation, Net of Forfeitures | $ |  |  |  | $ 294,000 | $ 145,000 |
Weighted aerage grant date fair value (in usd per share) | $ / shares |  |  |  | $ 19.92 | $ 25.43 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  |  | 14,844 | 5,712 |
Amended And Restated 2006 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares Reserved (in shares) | shares |  |  |  | 0 |  |
Shares Available to Issue (in shares) | shares |  |  |  | 0 |  |
Options Outstanding (in shares) | shares |  |  |  | 964,000 |  |
Performance Awards Outstanding (in shares) | shares |  |  |  | 0 |  |
Cancelled shares (in shares) | shares |  |  |  | 900,000 |  |
2017 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares Reserved (in shares) | shares |  |  |  | 2,455,000 |  |
Shares Available to Issue (in shares) | shares |  |  |  | 1,642,000 |  |
Options Outstanding (in shares) | shares |  |  |  | 182,000 |  |
Performance Awards Outstanding (in shares) | shares |  |  |  | 497,000 |  |

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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=109197908&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=109197908&loc=d3e5070-113901 + Details
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