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7. Earnings Per Share (Details)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income per share:    
Weighted average common shares - basic 24,355,000 20,073,000
Incremental common shares attibutable to exercise of outstanding options and warrants 7,656,000 11,551,000
Weighted average common shares - diluted 32,011,000 31,624,000