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Shared-Based Compensation And Share Repurchase Plans (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 07, 2017 | May 16, 2014 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 14, 2019 | Sep. 30, 2017
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  | $ 881,000 |  |  |  |
Recognition period of unrecognized compensation cost |  |  |  | 1 year 9 months 22 days |  |  |  |
Proceeds from the exercise of stock option |  |  |  | $ 344,000 | $ 52,000 | $ 146,000 |  |
Stock Option [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Compensation expense |  |  |  | $ 425,000 | 310,000 | 284,000 |  |
Shares granted |  |  |  | 126,840 |  |  |  |
Proceeds from the exercise of stock option |  |  |  | $ 361,000 | 574,000 | $ 146,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Compensation expense |  |  |  | 1,000,000 | $ 668,000 |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  |  | $ 1,400,000 |  |  |  |
Shares granted |  |  |  | 97,600 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Directors [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  | 1 year |  |  |  |
Percentage of shares vested |  |  |  | 100.00% |  |  |  |
Restricted Stock Units (RSUs) [Member] | Management [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  | 4 years |  |  |
Percentage of shares vested |  |  |  | 25.00% |  |  |  |
2017 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Stock buy-back program period |  |  |  | 2 years |  |  |  |
2014 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  | $ 10,000,000 |  |  |  |  |  |
Repurchase program, shares authorized |  | 350,000 |  |  |  |  |  |
Share price |  | $ 11.74 |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares granted |  |  |  | 126,840 | 169,762 | 169,327 |  |
Class A [Member] | James Cotter Jr. [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Stock options terminated |  |  |  | 50,000 |  |  |  |
2010 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Additional shares authorized | 947,460 |  |  |  |  |  |  |
Common Stock shares remaining for future issuances |  |  |  |  |  |  |  | 302,540
Repurchase program, shares authorized |  |  |  |  |  |  |  | 302,540
2010 Stock Incentive Plan [Member] | Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  |  |  | 1,250,000 |  |  |  |
Common Stock shares remaining for future issuances |  |  |  | 1,031,970 |  |  |  |
2010 Stock Incentive Plan [Member] | Class A [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares granted |  |  | 0 |  |  |  |  |
2010 Stock Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  | 0 years |  |  |  |
2010 Stock Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  | 4 years |  |  |  |
Subsequent Event [Member] | Class A [Member] | 2017 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  |  |  |  |  | $ 16,200,000 |

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