Shareholders' Equity (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013
Summary of stock option activity under the plans
Number of Shares, Beginning Balance	1,539,618
Weighted Average Exercise Price, Beginning Balance	$ 3.55
Granted at fair value, Number of Shares	172,530
Granted at fair value, Weighted Average Exercise Price	$ 3.11
Exercised, Number of Shares	(500)
Exercised, Weighted Average Exercise Price	$ 2.45
Forfeited, Number of Shares	(25,511)
Forfeited, Weighted Average Exercise Price	$ 3.48
Expired, Number of Shares	(61,575)
Expired, Weighted Average Exercise Price	$ 4.62
Number of Shares, Ending Balance	1,624,562
Weighted Average Exercise Price, Ending Balance	$ 3.47
Weighted Average Remaining Contractual Life (in years), Balance at March 31, 2013	4 years 1 month 10 days
Aggregate Intrinsic Value	$ 464,000
Vested and expected to vest, Number of Shares, at March 31, 2013	1,564,503
Vested and expected to vest, Weighted Average Exercise Price, at March 31, 2013	$ 3.47
Vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	4 years 7 days
Vested and expected to vest, Aggregate Intrinsic Value	461,000
Exercisable, Number of Shares at March 31, 2013	1,170,786
Exercisable, Weighted Average Exercise Price, at March 31, 2013	$ 3.43
Exercisable, Weighted Average Remaining Contractual Life (in years)	3 years 2 months 19 days
Exercisable, Aggregate Intrinsic Value	$ 430,000