Equity And Stock-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended			24 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	May. 16, 2014
Equity And Stock-Based Compensation [Line Items]
Restricted vesting period	5 years
Unrecognized estimated compensation cost related to non-vested stock options granted	$ 576,248			$ 576,248
Recognition period of unrecognized compensation cost	1 year 9 months 29 days
Cash received from exercise of stock options	$ 3,000,000	$ 978,000	$ 248,000
Expiration period for stock options	10 years
Repurchased program, amount repurchased	$ 3,110,000	4,070,000		$ 7,178,000
Stock Option [Member]
Equity And Stock-Based Compensation [Line Items]
Compensation expense	$ 282,308	$ 146,000	$ 199,000
May 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
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			1,250,000
Common Stock shares remaining for future issuances	551,800			551,800
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