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Statements of Stockholders' Equity - USD ($)
Total
Common Stock
Capital in Excess of Par Value
Accumulated (Deficit) Surplus
Treasury Stock
Accumulated Other Comprehensive (Loss)
Balance at Dec. 31, 2012 $ 9,194,683 $ 326,115 $ 9,973,146 $ (524,803) $ (529,655) $ (50,120)
Balance (in shares) at Dec. 31, 2012   3,261,148     242,114  
Net income (loss) 117,395 $ 0 0 117,395 $ 0 0
Other comprehensive income (loss), net of taxes 30,284 0 0 0 0 30,284
Exercise of stock options 21,750 0 6,436 0 $ 15,314 0
Exercise of stock options, Shares         (7,000)  
Tax benefits related to stock options 398 0 398 0 $ 0 0
Stock-based compensation 31,359 0 31,359 0 0 0
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) (167,159) $ 0 0 (167,159) $ 0 0
Other comprehensive income (loss), net of taxes (3,495) 0 0 0 0 (3,495)
Exercise of stock options 3,149 0 962 0 $ 2,187 0
Exercise of stock options, Shares         (1,000)  
Tax benefits related to stock options 0          
Stock-based compensation 30,004 0 30,004 0 $ 0 0
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) 1,213,239 $ 0 0 1,213,239 $ 0 0
Other comprehensive income (loss), net of taxes (26,925) 0 0 0 0 (26,925)
Exercise of stock options 120,210 0 58,957 0 $ 61,253 0
Exercise of stock options, Shares         (28,000)  
Tax benefits related to stock options 25,706 0 25,706 0 $ 0 0
Stock-based compensation 23,222 0 23,222 0 0 0
Balance at Dec. 31, 2015 $ 10,613,820 $ 326,115 $ 10,150,190 $ 638,672 $ (450,901) $ (50,256)
Balance (in shares) at Dec. 31, 2015   3,261,148     206,114