Stock Compensation Plans (Details) (USD $)	3 Months Ended						9 Months Ended			12 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 1998 Stock Option Plan [Member]	Dec. 31, 2011 1998 Stock Option Plan [Member]	Dec. 31, 2010 1998 Stock Option Plan [Member]	Sep. 30, 2012 2002 Stock Option Plan [Member]	Dec. 31, 2011 2002 Stock Option Plan [Member]	Dec. 31, 2010 2002 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding exercisable options (in shares)	817,800						817,800		78,500	89,750	89,750	739,300	624,700	574,800
Summary information about stock options outstanding [Abstract]
Range of Exercise Price, Minimum (in dollars per share)									$ 8.67			$ 2.45
Range of Exercise Price, Maximum (in dollars per share)									$ 16.59			$ 18.21
Weighted Average Contractual Periods in Years									11 months 19 days			6 years 1 month 10 days
Expected term of stock options in Black-Scholes option pricing model, previous							4 years
Expected term of stock options in Black-Scholes option pricing model, revised							2 years
Stock Option Plans, Shares Outstanding [Abstract]
Outstanding (in shares)									89,750	89,750	124,599	624,700	574,800	736,951
Granted (in shares)	0	181,500	0	178,000	0	0			0	0	0	181,500	179,000	109,500
Exercised (in shares)									0	0	0	(4,834)	0	0
Cancelled (in shares)									(11,250)	0	(34,849)	(62,066)	(129,100)	(271,651)
Outstanding (in shares)	817,800						817,800		78,500	89,750	89,750	739,300	624,700	574,800
Stock Options, Weighted Average Option Exercise Price [Abstract]
Outstanding (in dollars per share)									$ 12.83	$ 12.83	$ 15.88	$ 6.15	$ 9.12	$ 12.03
Granted (in dollars per share)									$ 0	$ 0	$ 0	$ 4.40	$ 2.45	$ 3.59
Exercised (in dollars per share)									$ 0	$ 0	$ 0	$ 3.29	$ 0	$ 0
Cancelled (in dollars per share)									$ 13.54	$ 0	$ 23.74	$ 13.59	$ 14.29	$ 14.78
Outstanding (in dollars per share)									$ 12.73	$ 12.83	$ 12.83	$ 5.11	$ 6.15	$ 9.12
Options Exercisable at [Abstract]
September 30, 2012 (in shares)									70,800			335,461
December 31, 2012 (in shares)									7,000			8,434
December 31, 2013 (in shares)									700			167,724
December 31, 2014 (in shares)									0			148,381
December 31, 2015 (in shares)									0			79,300
December 31, 2016 (in shares)									0			0
Thereafter (in shares)									0			0
Total options exercisable (in shares)									78,500			739,300
Options Weighted Average Option Exercise Price at [Abstract]
September 30, 2012 (in dollars per share)									$ 12.73			$ 5.11
December 31, 2012 (in dollars per share)									$ 12.73			$ 5.11
December 31, 2013 (in dollars per share)									$ 12.73			$ 5.11
December 31, 2014 (in dollars per share)									$ 0			$ 5.11
December 31, 2015 (in dollars per share)									$ 0			$ 5.11
December 31, 2016 (in dollars per share)									$ 0			$ 0
Thereafter (in dollars per share)									$ 0			$ 0
Decrease in income from continuing operations due to change in accounting pronouncement	$ 73,000			$ 61,000			$ 201,000	$ 178,000
Decrease in net income due to change in accounting pronouncement	$ 45,000			$ 38,000			$ 125,000	$ 111,000
Net Income (Loss) Per Share after Change in Accounting Pronouncement, Basic (in dollars per share)	$ 0.1			$ 0.5			$ 0.42	$ 0.29
Net Income (Loss) Per Share after Change in Accounting Pronouncement, Diluted (in dollars per share)	$ 0.1			$ 0.5			$ 0.42	$ 0.29
Net income (loss) per share - basic (in dollars per share)	$ 0.09			$ 0.05			$ 0.40	$ (0.3)
Net income (loss) per share - diluted (in dollars per share)	$ 0.09			$ 0.05			$ 0.40	$ (0.3)
Stock Options, Grant Date Fair Value Assumptions [Abstract]
Expected volatility							39.79%	39.08%
Risk-free interest rate							0.28%	0.20%
Expected life							4 years 5 months 12 days	4 years 4 months 6 days