Computation of Diluted Earnings Per Share (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Anti-dilutive common stock options, Number of Shares	401,000	513,000
Anti-dilutive common stock warrants, Number of Shares		8,000
Anti-dilutive common stock warrants, Range of Exercise Price Per Share		$ 4.31
Minimum [Member]
Anti-dilutive common stock options, Range of Exercise Price Per Share	$ 0.55	$ 1.31
Maximum [Member]
Anti-dilutive common stock options, Range of Exercise Price Per Share	$ 7.50	$ 7.50