Stock Option Plans (Details 5) (Officer and Employee Plans [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Exercise Prices	$ 3.86	$ 4.63	$ 5.79	$ 6.18
Number Outstanding	670,300	572,600	520,900	799,675
Options Outstanding, Weighted Average Remaining Life	6 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 3.86
Options, Number Exercisable	274,680	295,415	385,270
Options Exercisable, Weighted Average Exercise Price	$ 6.82
Exercise Price One [Member]
Exercise Prices	$ 3.63
Number Outstanding	49,000
Options Outstanding, Weighted Average Remaining Life	2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 3.63
Options, Number Exercisable	49,000
Options Exercisable, Weighted Average Exercise Price	$ 3.63
Exercise Price Two [Member]
Exercise Prices	$ 5.44
Number Outstanding	65,640
Options Outstanding, Weighted Average Remaining Life	1 year 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 5.44
Options, Number Exercisable	65,640
Options Exercisable, Weighted Average Exercise Price	$ 5.44
Exercise Price Three [Member]
Exercise Prices	$ 9.23
Number Outstanding	39,910
Options Outstanding, Weighted Average Remaining Life	2 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 9.23
Options, Number Exercisable	39,910
Options Exercisable, Weighted Average Exercise Price	$ 9.23
Exercise Price Four [Member]
Exercise Prices	$ 13.25
Number Outstanding	17,000
Options Outstanding, Weighted Average Remaining Life	3 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 13.25
Options, Number Exercisable	17,000
Options Exercisable, Weighted Average Exercise Price	$ 13.25
Exercise Price Five [Member]
Exercise Prices	$ 15.25
Number Outstanding	11,950
Options Outstanding, Weighted Average Remaining Life	4 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 15.25
Options, Number Exercisable	11,950
Options Exercisable, Weighted Average Exercise Price	$ 15.25
Exercise Price Six [Member]
Exercise Prices	$ 15.2
Number Outstanding	2,750
Options Outstanding, Weighted Average Remaining Life	4 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 15.2
Options, Number Exercisable	2,750
Options Exercisable, Weighted Average Exercise Price	$ 15.2
Exercise Price Seven [Member]
Exercise Prices	$ 7.99
Number Outstanding	45,500
Options Outstanding, Weighted Average Remaining Life	5 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 7.99
Options, Number Exercisable	45,500
Options Exercisable, Weighted Average Exercise Price	$ 7.99
Exercise Price Eight [Member]
Exercise Prices	$ 3.6
Number Outstanding	71,550
Options Outstanding, Weighted Average Remaining Life	6 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 3.6
Options, Number Exercisable	42,930
Options Exercisable, Weighted Average Exercise Price	$ 3.6
Exercise Price Nine [Member]
Exercise Prices	$ 1.7
Number Outstanding	174,000
Options Outstanding, Weighted Average Remaining Life	8 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 1.7
Options, Number Exercisable	0
Options Exercisable, Weighted Average Exercise Price	$ 0
Exercise Price Ten [Member]
Exercise Prices	$ 1.55
Number Outstanding	3,000
Options Outstanding, Weighted Average Remaining Life	8 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 1.55
Options, Number Exercisable	0
Options Exercisable, Weighted Average Exercise Price	$ 0
Exercise Price Eleven [Member]
Exercise Prices	$ 1.1
Number Outstanding	5,000
Options Outstanding, Weighted Average Remaining Life	8 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 1.1
Options, Number Exercisable	0
Options Exercisable, Weighted Average Exercise Price	$ 0
Exercise Price Twelve [Member]
Exercise Prices	$ 1.02
Number Outstanding	5,000
Options Outstanding, Weighted Average Remaining Life	8 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 1.02
Options, Number Exercisable	0
Options Exercisable, Weighted Average Exercise Price	$ 0
Exercise Price Thirteen [Member]
Exercise Prices	$ 1.65
Number Outstanding	180,000
Options Outstanding, Weighted Average Remaining Life	9 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 1.65
Options, Number Exercisable	0
Options Exercisable, Weighted Average Exercise Price	$ 0