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7. Earnings Per Share (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share Details        
Weighted average common shares - basic 20,989 19,305 20,534 19,360
Incremental common shares attibutable to exercise of outstanding options and warrants 10,799 5,331 11,175 3,923
Weighted average common shares - diluted 31,788 24,636 31,709 23,283