Stock Based Compensation - Exercise Price Range (Details) (USD $)	0 Months Ended
	Dec. 31, 2012
Exercise price range:
Exercise price range, number of outanding options	374,875
Exercise price range, exercisable, number of outstanding options	360,475
2.75
Exercise price range:
Exercise price range, range of exercise prices	$ 2.75
Exercise price range, number of outanding options	53,100
Exercise price range, weighted average contractual life in years	1 year 9 months 18 days
Exercise price range, exercisable, number of outstanding options	38,700
3.21
Exercise price range:
Exercise price range, range of exercise prices	$ 3.21
Exercise price range, number of outanding options	258,775
Exercise price range, weighted average contractual life in years	1 year 1 month 6 days
Exercise price range, exercisable, number of outstanding options	258,775
3.28
Exercise price range:
Exercise price range, range of exercise prices	$ 3.28
Exercise price range, number of outanding options	40,000
Exercise price range, weighted average contractual life in years	2 years 2 months 12 days
Exercise price range, exercisable, number of outstanding options	40,000
6.40
Exercise price range:
Exercise price range, range of exercise prices	$ 6.40
Exercise price range, number of outanding options	18,000
Exercise price range, weighted average contractual life in years	2 years 9 months 18 days
Exercise price range, exercisable, number of outstanding options	18,000
7.98
Exercise price range:
Exercise price range, range of exercise prices	$ 7.98
Exercise price range, number of outanding options	5,000
Exercise price range, weighted average contractual life in years	3 years
Exercise price range, exercisable, number of outstanding options	5,000