Common Stock (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Common Stock [Line Items]
Realized value, options exercised	$ 99,500	$ 136,000
Options exercised	50,000	95,000
Cash received for options exercised	200,000	308,000
Incremental Shares Issued [Member]
Common Stock [Line Items]
Exercise price per share	$ 4.01
Market price per share	$ 5.66
In the money shares exercise of options, net	53,136
Realized value, options exercised	124,000
Options exercised	75,000
Executive Officer [Member] | Class A Nonvoting Common Stock [Member]
Common Stock [Line Items]
Common stock, shares issued	217,890	155,925
Options exercised	50,000	95,000
Cash received for options exercised	$ 200,500	$ 308,000