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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, 2013 $ 23,614,574 $ 2,660,382 $ 23,215,875 $ 310,772 $ 40,574,211 $ (2,624,625) $ 87,751,189
Prior period adjustment         $ 6,405,271   $ 6,405,271
Balance at January 1, 2014 (As Restated) 23,614,574 2,660,382 23,215,875 310,772 46,979,482 (2,624,625) 94,156,460
Other comprehensive income       $ (49,415)     $ (49,415)
Grant of stock options     $ 391,220       391,220
Reverse stock true-up   $ 30     $ (30)    
Exercise of stock options $ 108,824   (34,800)       74,024
Sale of treasury stock     361,679     $ 538,171 899,850
Stock Dividends 1,190,040 132,767 1,997,147   (3,319,954)    
Conversion Class C to Class A 5,042 (5,041) (2)   1    
Net earnings         8,216,832   8,216,832
Balance at Dec. 31, 2014 24,918,480 2,788,138 25,931,119 261,357 51,876,331 (2,086,454) 103,688,971
Other comprehensive income       (760,715)     (760,715)
Grant of stock options     387,608       387,608
Exercise of stock options 47,922 483,304 (55,717)     (441,832) 33,677
Sale of treasury stock     666,840     530,396 1,197,236
Purchase of treasury stock           (181,539) (181,539)
Stock Dividends 1,248,966 150,670 3,302,732   (4,702,368)    
Conversion Class C to Class A 2,832 (2,832)          
Net earnings         13,351,441   13,351,441
Balance at Dec. 31, 2015 26,218,200 3,419,280 30,232,582 (499,358) 60,525,404 (2,179,429) 117,716,679
Other comprehensive income       764,180     764,180
Grant of stock options     343,577       343,577
Exercise of stock options 85,268 209,950 (179,112)       116,106
Sale of treasury stock     621,144     808,818 1,429,962
Stock Dividends 1,315,838 193,934 3,795,055   (5,304,827)    
Conversion Class C to Class A 18,706 (18,706)          
Net earnings         12,188,627   12,188,627
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