Stock Compensation Plans (Details) (USD $)	3 Months Ended		6 Months Ended					12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013 1998 Stock Option Plan [Member]	Dec. 31, 2012 1998 Stock Option Plan [Member]	Dec. 31, 2011 1998 Stock Option Plan [Member]	Jun. 30, 2013 2002 Stock Option Plan [Member]	Dec. 31, 2012 2002 Stock Option Plan [Member]	Dec. 31, 2011 2002 Stock Option Plan [Member]	Jun. 30, 2013 2012 Stock Incentive Plan [Member]	Dec. 31, 2012 2012 Stock Incentive Plan [Member]	Dec. 31, 2011 2012 Stock Incentive Plan [Member]	Jun. 30, 2013 2012 Stock Incentive Plan [Member] Chief Executive Officer and President [Member]	Jun. 30, 2013 2012 Stock Incentive Plan [Member] Chief Financial Officer [Member]	Jun. 30, 2013 2012 Stock Incentive Plan [Member] Director [Member]	Jun. 30, 2013 2012 Stock Incentive Plan [Member] Other Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to grant options to purchase (in shares)							900,000			1,800,000			1,000,000
Share-based payment award, expiration date							Sep. 30, 2008			Apr. 30, 2012			Apr. 05, 2022
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)							78,500	89,750	89,750	702,597	624,700	574,800
Granted (in shares)							0	0	0	0	181,500	179,000
Exercised (in shares)							0	0	0	(74,809)	(33,104)	0
Cancelled (in shares)							(25,000)	(11,250)	0	(10,666)	(70,499)	(129,100)
Outstanding (in shares)							53,500	78,500	89,750	617,122	702,597	624,700
Stock Options, Weighted Average Option Exercise Price [Abstract]
Outstanding (in dollars per share)							$ 12.73	$ 12.83	$ 12.83	$ 5.17	$ 6.15	$ 9.12
Granted (in dollars per share)							$ 0	$ 0	$ 0	$ 0	$ 4.40	$ 2.45
Exercised (in dollars per share)							$ 0	$ 0	$ 0	$ 3.92	$ 3.86	$ 0
Cancelled (in dollars per share)							$ 11.15	$ 13.54	$ 0	$ 3.68	$ 12.45	$ 14.29
Outstanding (in dollars per share)							$ 13.46	$ 12.73	$ 12.83	$ 5.35	$ 5.17	$ 6.15
Other Than Stock Option Plans, Shares Outstanding [Abstract]
Outstanding (in shares)													0	0	0
Granted (in shares)													100,000.00	0	0	25,000	15,000	20,000	40,000
Exercised (in shares)													0	0	0
Cancelled (in shares)													(500.00)	0	0
Outstanding (in shares)													99,500.00	0	0
Other Than Stock Options, Fair Market Value at Grant [Abstract]
Outstanding (in dollars per share)													$ 0	$ 0	$ 0
Granted (in dollars per share)													$ 5.54		$ 0
Exercised (in dollars per share)													$ 0	$ 0	$ 0
Cancelled (in dollars per share)													$ 5.54	$ 0	$ 0
Outstanding (in dollars per share)													$ 5.54	$ 0	$ 0
Options Exercisable at [Abstract]
June 30, 2013 (in shares)							52,800			330,655
December 31, 2013 (in shares)							700			73,254
December 31, 2014 (in shares)							0			138,313
December 31, 2015 (in shares)							0			74,900
December 31, 2016 (in shares)							0			0
December 31, 2017 (in shares)							0			0
Thereafter (in shares)							0			0
Total options exercisable (in shares)							53,500			617,122
Options Weighted Average Option Exercise Price at [Abstract]
June 30, 2013 (in dollars per share)							$ 13.46			$ 5.35
December 31, 2013 (in dollars per share)							$ 13.46			$ 5.35
December 31, 2014 (in dollars per share)							$ 13.46			$ 5.35
December 31, 2015 (in dollars per share)							$ 13.46			$ 5.35
December 31, 2016 (in dollars per share)							$ 13.46			$ 5.35
December 31, 2017 (in dollars per share)							$ 13.46			$ 5.35
Thereafter (in dollars per share)							$ 13.46			$ 5.35
Decrease in income from continuing operations due to change in accounting pronouncement	$ 88,000	$ 70,000	$ 155,000		$ 128,000
Decrease in net income due to change in accounting pronouncement	$ 55,000	$ 44,000	$ 96,000		$ 80,000
Net income (loss) per share after change in accounting pronouncement, basic (in dollars per share)	$ 0.33	$ 0.19	$ 0.62		$ 0.32
Net income (loss) per share after change in accounting pronouncement, diluted (in dollars per share)	$ 0.32	$ 0.19	$ 0.61		$ 0.32
Net income (loss) per share - basic (in dollars per share)	$ 0.32	$ 0.18	$ 0.61		$ 0.31
Net income per share - diluted (in dollars per share)	$ 0.31	$ 0.18	$ 0.60		$ 0.31
Fair value of options granted is estimated on date of grant used assumptions [Abstract]
Dividend yield (in hundredths)				[1]		[1]
Expected volatility (in hundredths)				[1]	39.79%
Risk-free interest rate (in hundredths)				[1]	0.28%
Expected life				[1]	4 years 5 months 12 days
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			$ 13.24
Options Outstanding (in shares)							53,500			617,122
Weighted Average Contractual Periods in Years							4 months 2 days			5 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share)							$ 13.46			$ 5.35
Options Exercisable (in shares)							52,800			330,655

[1] NA - Not applicable