Stock Based Compensation (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Summary of the status of stock option plans
Outstanding at beginning of period, shares	581,888	587,342
Outstanding at beginning of period, weighted-average exercise price	$ 4.62	$ 4.68
Granted, shares	0	0
Granted, weighted-average exercise price	$ 0.00	$ 0.00
Exercised, shares	0	0
Exercised, weighted-average exercise price	$ 0.00	$ 0.00
Forfeited, shares	(316)	(5,454)
Forfeited, weighted-average exercise price	$ 2.51	$ 10.63
Expired, shares	(16,518)	0
Expired, weighted-average exercise price	$ 16.13	$ 0.00
Outstanding at end of period, shares	565,054	581,888
Outstanding at end of period, weighted-average exercise price	$ 4.29	$ 4.62
Options exercisable at period end, shares	456,473	395,233
Options exercisable at period end, weighted-average exercise price	$ 4.76	$ 5.70
Weighted-average fair value of options granted during the period