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Equity And Stock-Based Compensation (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | May. 16, 2014 | May. 14, 2004
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Grant date fair value of options vesting | $ 75,428 |  |  | $ 34,000 |  |  | $ 208,831 | $ 102,000 |  |
Unrecognized estimated compensation cost related to non-vested stock options granted | 653,626 |  |  |  |  |  | $ 653,626 |  |  |
Recognition period of unrecognized compensation cost |  |  |  |  |  |  | 1 year 10 months 10 days |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest | 2,300,000 |  |  |  |  |  | $ 2,300,000 |  |  |
Percentage of option currently exercisable |  |  |  |  |  |  | 58.30% |  |  |
May 2014 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 10,000,000 |
Repurchase program, shares authorized |  |  |  |  |  |  |  |  |  | 350,000
Repurchased program, amount repurchased |  |  |  |  |  |  | $ 7,200,000 |  |  |
Repurchase program, average price per share |  |  |  |  |  |  | $ 12.92 |  |  |
Repurchase program, remaining amount authorized | $ 2,800,000 |  |  |  |  |  | $ 2,800,000 |  |  |
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued | 0 | 0 |  | 0 | 0 |  |  |  |  |
Options exercised |  |  |  |  |  |  | 336,100 |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan | 1,250,000 |  |  |  |  |  | 1,250,000 |  |  |
Common Stock shares remaining for future issuances | 663,800 |  |  |  |  |  | 663,800 |  |  |
Class A Nonvoting Common Stock [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued |  |  | 160,643 |  |  | 125,209 |  |  |  |
Class A Nonvoting Common Stock [Member] | Employee/Director [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Realized value of option exercised |  |  |  |  |  |  | $ 1,700,000 |  |  |
Cash received from exercise of stock options |  |  |  |  |  |  | $ 2,700,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options |  |  |  |  |  |  | 0 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options |  |  |  |  |  |  | 4 years |  |  |

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