Shareholders' Equity (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2012
Summary of stock option activity under the plans
Number of shares, Beginning Balance	1,939,475
Weighted Average Exercise Price, Beginning Balance	$ 4.49
Granted at fair value, Number of shares	164,875
Granted at fair value, Weighted Average Exercise Price	$ 3.44
Exercised, Number of Shares	(29,476)
Exercised, Weighted Average Exercise Price	$ 2.49
Forfeited, Number of Shares	(67,165)
Forfeited, Weighted Average Exercise Price	$ 3.73
Expired, Number of Shares	(50,501)
Expired, Weighted Average Exercise Price	$ 9.84
Number of shares, Ending Balance	1,957,208
Weighted Average Exercise Price, Ending Balance	$ 4.32
Weighted Average Remaining Contractual Life (in years), Ending Balance	3 years 8 months 19 days
Aggregate Intrinsic Value, Ending Balance	$ 395,000
Vested and expected to vest, Number of Shares, Ending Balance	1,872,527
Vested and expected to vest, Weighted Average Exercise Price, Ending Balance	$ 4.27
Vested and expected to vest, Weighted Average Remaining Contractual Life (in years), Ending Balance	3 years 7 months 17 days
Vested and expected to vest, Aggregate Intrinsic Value, Ending Balance	391,000
Exercisable, Number of Shares, Ending Balance	1,373,749
Exercisable, Weighted Average Exercise Price, Ending Balance	$ 3.83
Exercisable, Weighted Average Remaining Contractual Life (in years), Ending Balance	3 years 7 days
Exercisable, Aggregate Intrinsic Value, Ending Balance	$ 353,000