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6. Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2015
Stockholders Equity Tables  
Changes in consolidated stockholders' equity
    Common Stock Shares     Common Stock Amount     Additional Paid-In Capital     Retained Earnings     Total  
                               
Balance at December 31, 2014     13,665,087     $ 8,199     $ 24,816     $ 218     $ 33,233  
Common stock option exercise and issued     25,673       15       26             41  
Share-based compensation expense                 7             7  
Net income                       538       538  
Balance at March 31, 2015     13,690,760     $ 8,214     $ 24,849     $ 756     $ 33,819