Stock-Based Compensation; Changes in Equity (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Shares under Option, Balance ( in shares)	162,500
Shares under Option, Granted (in shares)	0
Shares under Option, Cancelled (in shares)	1,000
Shares under Option, Exercised (in shares)	13,500
Shares under Option, Balance (in shares)	148,000
Shares under Option, Exercisable (in shares)	72,875
Weighted Average Exercise Price, Balance (in dollars per share)	$ 4.25
Weighted Average Exercise Price, Granted (in dollars per share)	$ 0
Weighted Average Exercise Price, Cancelled (in dollars per share)	$ 1.92
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 5.97
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 4.45
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.73
Weighted Average Contractual Life, Outstanding	2 years 4 months 24 days
Weighted Average Contractual Life, Exercisable	2 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding (in dollars)	$ 167,446
Aggregate Intrinsic Value, Exercisable (in dollars)	$ 167,446