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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
Retained Earnings
Treasury Stock
Total
Balance at Dec. 31, 2016 $ 27,638,012 $ 3,804,458 $ 34,813,246 $ 264,822 $ 67,409,204 $ (1,370,611) $ 132,559,131
Net earnings         1,860,000   1,860,000
Other comprehensive income       21,292     21,292
Grant of stock options     101,996       101,996
Sale of treasury stock     178,002     146,065 324,067
Purchase of treasury stock           (185,470) (185,470)
Stock Dividends 930 4 2,350   (3,284)    
Conversion Class C to Class A 1,214 (1,214)          
Balance at Mar. 31, 2017 27,640,156 3,803,248 35,095,594 286,114 69,265,920 (1,410,016) 134,681,016
Balance at Dec. 31, 2017 29,071,154 4,178,748 38,125,042 603,170 77,520,951 (931,075) 148,567,990
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-01)       $ (603,170) 603,170    
Net earnings         16,925,923   16,925,923
Grant of stock options     58,087       58,087
Exercise of stock options 63,968   (22,115)       41,853
Sale of treasury stock     88,964     222,410 311,374
Stock Dividends 3,520 (4) 5,362   (8,878)    
Balance at Mar. 31, 2018 $ 29,138,642 $ 4,178,744 $ 38,255,340   $ 95,041,166 $ (708,665) $ 165,905,227