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Statements of Stockholders' Equity (USD $) | Class A Common Stock | Class C Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 19,277,596 | $ 2,027,195 | $ 19,487,565 | $ 654,443 | $ 22,546,623 | $ (2,762,835) | $ 61,230,587
Net earnings |  |  |  |  | 1,662,183 |  | 1,662,183
Other comprehensive income |  |  |  | 979,930 |  |  | 979,930
Grant of stock options |  |  | 47,218 |  |  |  | 47,218
Sale of treasury stock |  |  | (41,121) |  |  | 96,635 | 55,514
Balance at Mar. 31, 2012 | 19,277,596 | 2,027,195 | 19,493,662 | 1,634,373 | 24,208,806 | (2,666,200) | 63,975,432
Balance at Dec. 31, 2012 | 21,687,152 | 2,194,820 | 21,262,140 | 1,934,359 | 35,114,072 | (2,380,434) | 79,812,109
Net earnings |  |  |  |  | 2,033,266 |  | 2,033,266
Other comprehensive income |  |  |  | (375,426) |  |  | (375,426)
Grant of stock options |  |  | 52,969 |  |  |  | 52,969
Exercise of stock options | 204,206 | 86,677 | (74,155) |  |  |  | 216,728
Sale of treasury stock |  |  | 63,986 |  |  | 19,727 | 83,713
Conversion Class C to Class A | 1,818 | (1,819) | 1 |  |  |  |
Balance at Mar. 31, 2013 | $ 21,893,176 | $ 2,279,678 | $ 21,304,941 | $ 1,558,933 | $ 37,147,338 | $ (2,360,707) | $ 81,823,359

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