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Statements of Stockholders' Equity (Unaudited) - USD ($)
Total
Common Stock
Capital in Excess of Par Value
Accumulated (Deficit) Surplus
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) (297,786) $ 0 0 (297,786) $ 0 0
Other comprehensive income (loss), net of taxes 193 0 0 0 0 193
Exercise of stock options 3,150 $ 0 962 0 $ 2,188 0
Exercise of stock options, Shares   0     (1,000)  
Stock-based compensation 22,265 $ 0 22,265 0 $ 0 0
Balance at Sep. 30, 2014 9,123,691 $ 326,115 10,034,566 (705,194) $ (512,153) (19,643)
Balance (in shares) at Sep. 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) 924,432 $ 0 0 924,432 $ 0 0
Other comprehensive income (loss), net of taxes (48,059) 0 0 0 0 (48,059)
Exercise of stock options 120,210 $ 0 58,957 0 $ 61,253 0
Exercise of stock options, Shares   0     (28,000)  
Tax benefits related to stock options 25,707 $ 0 25,707 0 $ 0 0
Stock-based compensation 17,825 0 17,825 0 0 0
Balance at Sep. 30, 2015 $ 10,298,483 $ 326,115 $ 10,144,794 $ 349,865 $ (450,901) $ (71,390)
Balance (in shares) at Sep. 30, 2015   3,261,148     206,114