Computation of Diluted Earnings Per Share (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Anti-dilutive common stock options, Number of Shares	449,000	513,000
Anti-dilutive common stock warrants, Number of Shares	8,000	8,000
Anti-dilutive common stock warrants, Range of Exercise Price Per Share	$ 4.31	$ 4.31
Minimum [Member]
Anti-dilutive common stock options, Range of Exercise Price Per Share	$ 1.31	$ 1.31
Maximum [Member]
Anti-dilutive common stock options, Range of Exercise Price Per Share	$ 7.50	$ 7.50