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STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) | Preferred Stock Series I, Class B | Preferred Stock Series II, Class B | Preferred Stock Series III, Class B | Preferred Stock Series IV, Class B | Preferred Stock Series V, Class B | Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 103,500 | $ 178,700 | $ 130,245 | $ 542,500 | $ 46,607 |  | $ 58,617,308 | $ (23,767,662) | $ (122,202) | $ 35,728,996
Balance (in shares) at Dec. 31, 2012 | 103,500 | 178,700 | 130,245 | 542,500 | 46,607 | 27,252,463 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock into Common Stock |  |  |  |  | $ (6,607) |  | 6,607 |  |  |
Conversion of Preferred Stock into Common Stock (in shares) |  |  |  |  | (6,607) | 6,607 |  |  |  |
Recognition of stock option compensation |  |  |  |  |  |  | 52,775 |  |  | 52,775
Recognition of stock option exercise |  |  |  |  |  |  | 536,925 |  |  | 536,925
Recognition of stock option exercise (in shares) |  |  |  |  |  | 584,450 |  |  |  |
Dividends |  |  |  |  |  |  | (230,449) |  |  | (230,449)
Repurchase of Common Stock |  |  |  |  |  |  |  |  | (974,407) | (974,407)
Repurchase of Common Stock (in shares) |  |  |  |  |  | (655,818) |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | (6,213,852) |  | (6,213,852)
Balance at Dec. 31, 2013 | $ 103,500 | $ 178,700 | $ 130,245 | $ 542,500 | $ 40,000 |  | 58,983,166 | (29,981,514) | (1,096,609) | 28,899,988
Balance (in shares) at Dec. 31, 2013 | 103,500 | 178,700 | 130,245 | 542,500 | 40,000 | 27,187,702 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock into Common Stock | $ (5,000) | $ (2,500) |  |  |  |  | 7,500 |  |  |
Conversion of Preferred Stock into Common Stock (in shares) | (5,000) | (2,500) |  |  |  | 7,500 |  |  |  |
Recognition of stock option compensation |  |  |  |  |  |  | 398,328 |  |  | 398,328
Recognition of stock option exercise (in shares) |  |  |  |  |  | 418,195 |  |  |  |
Dividends |  |  |  |  |  |  | (115,225) |  |  | (115,225)
Net income (loss) |  |  |  |  |  |  |  | (2,354,605) |  | (2,354,605)
Balance at Dec. 31, 2014 | $ 98,500 | $ 176,200 | $ 130,245 | $ 542,500 | $ 40,000 |  | 59,273,769 | (32,336,119) | (1,096,609) | 26,828,486
Balance (in shares) at Dec. 31, 2014 | 98,500 | 176,200 | 130,245 | 542,500 | 40,000 | 27,613,397 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock into Common Stock |  | $ (5,000) | $ (1,000) | $ (200,000) |  |  | 206,000 |  |  |
Conversion of Preferred Stock into Common Stock (in shares) |  | (5,000) | (1,000) | (200,000) |  | 206,000 |  |  |  |
Recognition of stock option exercise |  |  |  |  |  |  | 283,933 |  |  | 283,933
Recognition of stock option exercise (in shares) |  |  |  |  |  | 272,477 |  |  |  |
Issuance of new Common stock (in shares) |  |  |  |  |  | 528,000 |  |  |  |
Registration of new shares |  |  |  |  |  |  | (60,101) |  |  | (60,101)
Retirement of treasury stock |  |  |  |  |  |  | (1,096,609) |  | $ 1,096,609 |
Dividends |  |  |  |  |  |  | (338,956) |  |  | (338,956)
Net income (loss) |  |  |  |  |  |  |  | 4,314,318 |  | 4,314,318
Balance at Dec. 31, 2015 | $ 98,500 | $ 171,200 | $ 129,245 | $ 342,500 | $ 40,000 |  | $ 58,268,036 | $ (28,021,801) |  | $ 31,027,680
Balance (in shares) at Dec. 31, 2015 | 98,500 | 171,200 | 129,245 | 342,500 | 40,000 | 28,619,874 |  |  |  |

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