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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     284,477       284,477
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   10,886          
Vesting of restricted stock awards, Amount   $ 109 (109)       0
Shares deducted from restricted stock awards for payment of withholding taxes, Shares   (1,154)          
Shares deducted from restricted stock awards for payment of withholding taxes, Amount   $ (14) (21,509)       (21,523)
Exercise of stock options, Shares   73,276          
Exercise of stock options, Amount   $ 736 46,147       46,883
Acquisition of treasury stock, Shares           37,635  
Acquisition of treasury stock, Amount           $ (540,223) (540,223)
Dividends         (2,134,759)   (2,134,759)
Net loss         39,363   39,363
Change in unrealized losses on available-for-sale securities, net of tax       (3,183,386)     (3,183,386)
Ending Balance, Shares at Jun. 30, 2018 0 11,685,904       1,024,444  
Ending Balance, Amount at Jun. 30, 2018 $ 0 $ 116,859 68,347,784 (2,496,981) 25,471,668 $ (2,712,522) 88,726,808
Beginning Balance, Shares at Mar. 31, 2018 0 11,679,334       1,012,669  
Beginning Balance, Amount at Mar. 31, 2018 $ 0 $ 116,793 68,163,744 (1,391,063) 23,780,755 $ (2,509,193) 88,161,036
Stock-based compensation     176,109       176,109
Vesting of restricted stock awards, Shares   3,706          
Vesting of restricted stock awards, Amount   $ 37 (37)       0
Shares deducted from restricted stock awards for payment of withholding taxes, Shares   (536)          
Shares deducted from restricted stock awards for payment of withholding taxes, Amount   $ (5) (9,304)       (9,309)
Exercise of stock options, Shares   3,400          
Exercise of stock options, Amount   $ 34 17,272       17,306
Acquisition of treasury stock, Shares           11,775  
Acquisition of treasury stock, Amount           $ (203,329) (203,329)
Dividends         (1,066,384)   (1,066,384)
Net loss         2,757,297   2,757,297
Change in unrealized losses on available-for-sale securities, net of tax       (1,105,918)     (1,105,918)
Ending Balance, Shares at Jun. 30, 2018 0 11,685,904       1,024,444  
Ending Balance, Amount at Jun. 30, 2018 $ 0 $ 116,859 68,347,784 (2,496,981) 25,471,668 $ (2,712,522) 88,726,808
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     709,207       709,207
Vesting of restricted stock awards, Shares   31,546          
Vesting of restricted stock awards, Amount   $ 314 (314)       0
Shares deducted from restricted stock awards for payment of withholding taxes, Shares   (7,607)          
Shares deducted from restricted stock awards for payment of withholding taxes, Amount   $ (75) (122,763)       (122,838)
Exercise of stock options, Shares   3,000          
Exercise of stock options, Amount   $ 30 23,520       23,550
Dividends         (2,153,349)   (2,153,349)
Net loss         (5,695,810)   (5,695,810)
Change in unrealized losses on available-for-sale securities, net of tax       6,243,360     6,243,360
Ending Balance, Shares at Jun. 30, 2019 0 11,802,087       1,027,439  
Ending Balance, Amount at Jun. 30, 2019 $ 0 $ 118,020 68,373,320 3,359,047 18,531,657 $ (2,712,552) 87,669,762
Beginning Balance, Shares at Mar. 31, 2019 0 11,796,188       1,027,439  
Beginning Balance, Amount at Mar. 31, 2019 $ 0 $ 117,962 67,957,604 442,493 17,969,664 $ (2,712,552) 83,775,171
Stock-based compensation     399,325       399,325
Vesting of restricted stock awards, Shares   3,553          
Vesting of restricted stock awards, Amount   $ 34 (34)       0
Shares deducted from restricted stock awards for payment of withholding taxes, Shares   (654)          
Shares deducted from restricted stock awards for payment of withholding taxes, Amount   $ (6) (6,825)       (6,831)
Exercise of stock options, Shares   3,000          
Exercise of stock options, Amount   $ 30 23,550       23,280
Dividends         (1,077,387)   (1,077,387)
Net loss         1,639,380   1,639,380
Change in unrealized losses on available-for-sale securities, net of tax       2,916,554     2,916,554
Ending Balance, Shares at Jun. 30, 2019 0 11,802,087       1,027,439  
Ending Balance, Amount at Jun. 30, 2019 $ 0 $ 118,020 $ 68,373,320 $ 3,359,047 $ 18,531,657 $ (2,712,552) $ 87,669,762