Stock Compensation Plans (Details) (USD $)	3 Months Ended				6 Months Ended			12 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 1998 Stock Option Plan [Member]	Dec. 31, 2011 1998 Stock Option Plan [Member]	Dec. 31, 2010 1998 Stock Option Plan [Member]	Jun. 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)	843,500				843,500		78,500	89,750	89,750	765,000	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							1 year 2 months 19 days			6 years 2 months 23 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)	181,500	0	0	0			0	0	0	181,500	179,000	109,500
Exercised (in shares)							0	0	0	(1,000)	0	0
Cancelled (in shares)							(11,250)	0	(34,849)	(40,200)	(129,100)	(271,651)
Outstanding (in shares)	843,500				843,500		78,500	89,750	89,750	765,000	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	$ 3.30	$ 0	$ 0
Cancelled (in dollars per share)							$ 13.54	$ 0	$ 23.74	$ 13.17	$ 14.29	$ 14.78
Outstanding (in dollars per share)							$ 12.92	$ 12.83	$ 12.83	$ 6.15	$ 6.15	$ 9.12
Options Exercisable at [Abstract]
June 30, 2012 (in shares)							67,100			280,400
December 31, 2012 (in shares)							10,700			87,863
December 31, 2013 (in shares)							700			168,388
December 31, 2014 (in shares)							0			149,049
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			765,000
Options Weighted Average Option Exercise Price at [Abstract]
June 30, 2012 (in dollars per share)							$ 12.92			$ 6.15
December 31, 2012 (in dollars per share)							$ 12.92			$ 6.15
December 31, 2013 (in dollars per share)							$ 12.92			$ 6.15
December 31, 2014 (in dollars per share)							$ 0			$ 6.15
December 31, 2015 (in dollars per share)							$ 0			$ 6.15
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	$ 70,000		$ 55,000		$ 128,000	$ 118,000
Decrease in net income due to change in accounting pronouncement	$ 44,000		$ 34,000		$ 80,000	$ 73,000
Net Income (Loss) Per Share after Change in Accounting Pronouncement, Basic (in dollars per share)	$ 0.19		$ (0.10)		$ 0.32	$ (0.34)
Net Income (Loss) Per Share after Change in Accounting Pronouncement, Diluted (in dollars per share)	$ 0.19		$ (0.10)		$ 0.32	$ (0.34)
Net income (loss) per share - basic (in dollars per share)	$ 0.18		$ (0.1)		$ 0.31	$ (0.35)
Net income (loss) per share - diluted (in dollars per share)	$ 0.18		$ (0.1)		$ 0.31	$ (0.35)
Stock Options, Grant Date Fair Value Assumptions [Abstract]
Dividend yield
Expected volatility					39.79%
Risk-free interest rate					0.28%
Expected life					4 years 5 months 12 days