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Stock-Based Compensation; Changes in Equity (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Shares, Balance (in shares) 218,500
Shares under Option, Granted (in shares) 0
Shares under Option, Cancelled (in shares) 0
Shares under Option, Exercised (in shares) 0
Shares, Outstanding (in shares) 218,500
Shares Exercisable 49,668
Weighted Average Exercise Price, Balance (in dollars per share) $ 5.21
Weighted Average Exercise Price, Granted (in dollars per share) $ 0
Weighted Average Exercise Price, Cancelled (in dollars per share) $ 0
Weighted Average Exercise Price, Exercised (in dollars per share) $ 0
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 5.21
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 4.13
Weighted Average Contractual Life, Outstanding 3 years 8 months 12 days
Weighted Average Contractual Life, Exercisable 2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding (in dollars) $ 182,405
Aggregate Intrinsic Value, Exercisable (in dollars) $ 92,175