Share-Based Compensation (Details) (USD $)	3 Months Ended		1 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 28, 2013 Incentive award	Feb. 29, 2012 Incentive award	Mar. 31, 2013 Stock Options	Mar. 31, 2012 Stock Options	Mar. 31, 2013 Restricted Stock
Share-Based Compensation
Total compensation expense recognized for share-based compensation (in dollars)	$ 108,000	$ 152,000
Tax benefit or expense related to compensation expense	0	0
Historical annual forfeiture rates (as a percent)	3.10%	3.90%
Share-Based Compensation
Incentive bonus on meeting certain performance metrics (in dollars)			133,100	150,300
Common stock issued (in shares)			33,187	39,294
Summary of stock option award activity
Outstanding at the beginning of the period (in shares)					79,000
Forfeited or cancelled (in shares)					(19,000)
Outstanding at the end of the period (in shares)					60,000
Exercisable at the end of the period (in shares)					55,000
Expected to vest at the end of the period (in shares)					3,600
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)					$ 23.52
Forfeited or cancelled (in dollars per share)					$ 35.82
Outstanding at the end of the period (in dollars per share)					$ 19.63
Exercisable at the end of the period (in dollars per share)					$ 20.94
Expected to vest at the end of the period (in dollars per share)					$ 5.20
Weighted Average Grant-Date Fair Value
Forfeited or cancelled (in dollars per share)					$ 12.29
Outstanding at the end of the period (in dollars per share)					$ 7.33
Exercisable at the end of the period (in dollars per share)					$ 7.77
Expected to vest at the end of the period (in dollars per share)					$ 2.48
Weighted Average Remaining Contractual Term
Outstanding at the end of the period					4 years 1 month 6 days
Exercisable at the end of the period					3 years 10 months 24 days
Expected to vest at the end of the period					5 years 10 months 24 days
Additional disclosure
Granted (in shares)					0	0
Exercised (in shares)					0	0
Fair value of shares vested (in dollars)					12,000	12,000
Total unamortized compensation expense (in dollars)					$ 12,000
Weighted average period for recognition of unamortized compensation expense					1 year
Summary of restricted stock activity
Nonvested balance at the beginning of the period (in shares)							94,137
Vested (in shares)							(19,148)
Nonvested balance at the end of the period (in shares)							74,989
Weighted Average Grant-Date Fair Value
Nonvested balance at the beginning of the period (in dollars per share)							$ 5.56
Vested (in dollars per share)							$ 4.65
Nonvested balance at the end of the period (in dollars per share)							$ 5.94