Equity And Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Equity And Stock-Based Compensation [Line Items]
Stocks granted	20,000	20,000
Recognized tax benefits from stock option exercises	$ 0
Grant date fair value of options vesting	57,000	80,000
Unrecognized estimated compensation cost related to non-vested stock options granted	342,000
Recognition period of unrecognized compensation cost	2 years 4 months 17 days
Options exercised	0	40,000
Realized value of option exercised		179,000
Cash received from exercise of stock options		100,000
Intrinsic unrealized value of all options outstanding, vested and expected to vest	392,000
Percentage of option currently exercisable	100.00%
Expiration period for stock options	10 years
Common Stock authorized for issuance under 2010 Stock Incentive Plan	1,250,000
Weighted average remaining contractual life of all options outstanding, vested, and expected to vest	5 years 15 days		5 years 3 months 26 days
Weighted average remaining contractual life of the exercisable options outstanding	3 years 11 months 5 days		4 years 3 months 11 days
Executive Officer [Member]
Equity And Stock-Based Compensation [Line Items]
Compensation expense	$ 188,000	$ 238,000
Class A [Member]
Equity And Stock-Based Compensation [Line Items]
Options exercised			136,000
Class A [Member] | Executive Officer [Member]
Equity And Stock-Based Compensation [Line Items]
Stocks granted	217,890	155,925
Class B [Member]
Equity And Stock-Based Compensation [Line Items]
Options exercised
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