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Statements of Stockholders' Equity (Unaudited) - USD ($)
Total
Common Stock
Capital in Excess of Par Value
Accumulated Deficit
Treasury Stock
Accumulated Other Comprehensive (Loss)
Balance at Dec. 31, 2013 $ 9,395,869 $ 326,115 $ 10,011,339 $ (407,408) $ (514,341) $ 19,836
Balance (in shares) at Dec. 31, 2013   3,261,148     235,114  
Net income (loss) (308,116) $ 0 0 (308,116) $ 0 0
Other comprehensive income (loss), net of taxes (4,824) 0 0 0 0 (4,824)
Exercise of stock options 3,150 0 962 0 $ 2,188 0
Exercise of stock options, Shares         (1,000)  
Tax benefits related to stock options 0          
Stock-based compensation 17,291 0 17,291 0 $ 0 0
Balance at Jun. 30, 2014 9,103,370 $ 326,115 10,029,592 (715,524) $ (512,153) (24,660)
Balance (in shares) at Jun. 30, 2014   3,261,148     234,114  
Balance at Dec. 31, 2014 9,258,368 $ 326,115 10,042,305 (574,567) $ (512,154) (23,331)
Balance (in shares) at Dec. 31, 2014   3,261,148     234,114  
Net income (loss) 573,140 $ 0 0 573,140 $ 0 0
Other comprehensive income (loss), net of taxes 1,088 0 0 0 0 1,088
Exercise of stock options 45,140 0 14,513 0 $ 30,627 0
Exercise of stock options, Shares         (14,000)  
Tax benefits related to stock options (14,480) 0 14,480 0 $ 0 0
Stock-based compensation 11,483 0 11,483 0 0 0
Balance at Jun. 30, 2015 $ 9,903,699 $ 326,115 $ 10,082,781 $ (1,427) $ (481,527) $ (22,243)
Balance (in shares) at Jun. 30, 2015   3,261,148     220,114