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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Preferred Stock
Common Stock
Capital in Excess of Par
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Total
Beginning Balance, Shares at Dec. 31, 2017 0 11,618,646       986,809  
Beginning Balance, Amount at Dec. 31, 2017 $ 0 $ 116,186 $ 68,380,390 $ 1,100,647 $ 27,152,822 $ (2,172,299) $ 94,577,746
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018       (414,242) 414,242   0
Beginning Balance, Shares, as adjusted 0 11,618,646       986,809  
Beginning Balance, Amount, as adjusted $ 0 $ 116,186 68,380,390 686,405 27,567,064 $ (2,172,299) 94,577,746
Stock-based compensation     108,368       108,368
Shares deducted from exercise of stock options for payment of withholding taxes, Shares   (15,750)          
Shares deducted from exercise of stock options for payment of withholding taxes, Amount   $ (158) (341,612)       (341,770)
Vesting of restricted stock awards, Shares   7,180          
Vesting of restricted stock awards, Amount   $ 72 (72)       0
Shares deducted from restricted stock awards for payment of withholding taxes, Shares   (618)          
Shares deducted from restricted stock awards for payment of withholding taxes, Amount   $ (9) (12,205)       (12,214)
Exercise of stock options, Shares   69,876          
Exercise of stock options, Amount   $ 702 28,875       29,577
Acquisition of treasury stock, Shares           25,860  
Acquisition of treasury stock, Amount           $ (366,894) (366,894)
Dividends         (1,068,375)   (1,068,375)
Net loss         (2,717,934)   (2,717,934)
Change in unrealized losses on available-for-sale securities, net of tax       (2,077,468)     (2,077,468)
Ending Balance, Shares at Mar. 31, 2018 0 11,679,334       1,012,669  
Ending Balance, Amount at Mar. 31, 2018 $ 0 $ 116,793 68,163,744 (1,391,063) 23,780,755 $ (2,509,193) 88,161,036
Beginning Balance, Shares at Dec. 31, 2018 0 11,775,148       1,027,439  
Beginning Balance, Amount at Dec. 31, 2018 $ 0 $ 117,751 67,763,940 (2,884,313) 26,380,816 $ (2,712,552) 88,665,642
Stock-based compensation     309,882       309,882
Vesting of restricted stock awards, Shares   27,593          
Vesting of restricted stock awards, Amount   $ 275 (275)       0
Shares deducted from restricted stock awards for payment of withholding taxes, Shares   (6,553)          
Shares deducted from restricted stock awards for payment of withholding taxes, Amount   $ (64) (115,943)       (116,007)
Dividends         (1,075,962)   (1,075,962)
Net loss         (7,335,190)   (7,335,190)
Change in unrealized losses on available-for-sale securities, net of tax       3,326,806     3,326,806
Ending Balance, Shares at Mar. 31, 2019 0 11,796,188       1,027,439  
Ending Balance, Amount at Mar. 31, 2019 $ 0 $ 117,962 $ 67,957,604 $ 442,493 $ 17,969,664 $ (2,712,552) $ 83,775,171