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Consolidated Statements of Stockholders' Equity (Unaudited) (USD $)
In Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Beginning Balance at Dec. 31, 2011 $ 52,879 $ 934 $ 28,150 $ 23,795
Sale of common stock 47,250 315 46,935  
Underwriting discount and offering expense (7,469)   (7,469)  
Reclassification of temporary equity 12,000   12,000  
Stock option expense 542   542  
Net income 25,367     25,367
Ending Balance at Dec. 31, 2012 130,569 1,249 80,158 49,162
Proceeds from exercise of stock options 944 9 935  
Stock option expense 179   179  
Net income 6,928     6,928
Ending Balance at Mar. 31, 2013 $ 138,620 $ 1,258 $ 81,272 $ 56,090