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Statements of changes in Stockholders' Equity (Deficit) - USD ($)
Common Stock
Common Class A
Common Stock
Common Class C
Additional Paid-in Capital
AOCI Attributable to Parent
Retained Earnings
Treasury Stock
Total
Stockholders' Equity Attributable to Parent, Beginning 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) 0 0 0 (603,170) 603,170 0 0
Net earnings 0 0 0 0 16,925,923 0 16,925,923
Share-based Payment Arrangement, Amount Capitalized 0 0 58,087 0 0 0 58,087
Proceeds from stock options exercised 63,968 0 (22,115) 0 0 0 41,853
Benefit plans funded with treasury stock 0 0 88,964 0 0 222,410 311,374
Stock dividends 3,520 (4) 5,362 0 (8,878) 0 0
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2018 29,138,642 4,178,744 38,255,340 0 95,041,166 (708,665) 165,905,227
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2017 29,071,154 4,178,748 38,125,042 603,170 77,520,951 (931,075) 148,567,990
Net earnings             20,164,140
Other comprehensive income, net of income tax             (1,448)
Share-based Payment Arrangement, Amount Capitalized             116,140
Proceeds from stock options exercised             41,853
Benefit plans funded with treasury stock             697,129
Payments to acquire treasury stock             0
Stockholders' Equity Attributable to Parent, Ending Balance at Jun. 30, 2018 29,139,018 4,178,368 38,476,728 (1,448) 98,279,383 (486,245) 169,585,804
Stockholders' Equity Attributable to Parent, Beginning Balance at Mar. 31, 2018 29,138,642 4,178,744 38,255,340 0 95,041,166 (708,665) 165,905,227
Net earnings 0 0 0 0 3,238,217 0 3,238,217
Other comprehensive income, net of income tax 0 0 0 (1,448) 0 0 (1,448)
Share-based Payment Arrangement, Amount Capitalized 0 0 58,053 0 0 0 58,053
Benefit plans funded with treasury stock 0 0 163,335 0 0 222,420 385,755
Conversion Class C to Class A 376 (376) 0 0 0 0 0
Stockholders' Equity Attributable to Parent, Ending Balance at Jun. 30, 2018 29,139,018 4,178,368 38,476,728 (1,448) 98,279,383 (486,245) 169,585,804
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2018 30,609,596 4,387,286 41,821,778 (2,823) 95,201,732 (206,396) 171,811,173
Net earnings 0 0 0 0 1,930,318 0 1,930,318
Other comprehensive income, net of income tax 0 0 0 820 0 0 820
Share-based Payment Arrangement, Amount Capitalized 0 0 64,704 0 0 0 64,704
Proceeds from stock options exercised 8,936 0 8,444 0 0 0 17,380
Benefit plans funded with treasury stock 0 0 295,153 0 0 42,343 337,496
Payments to acquire treasury stock 0 0 0 0 0 (112,404) (112,404)
Stock dividends 282 (4) 489 0 (769) 0 (2)
Conversion Class C to Class A 6,560 (6,560) 0 0 0 0 0
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2019 30,625,374 4,380,722 42,190,568 (2,003) 97,131,281 (276,457) 174,049,485
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2018 30,609,596 4,387,286 41,821,778 (2,823) 95,201,732 (206,396) 171,811,173
Net earnings             5,410,372
Other comprehensive income, net of income tax             1,536
Share-based Payment Arrangement, Amount Capitalized             129,741
Proceeds from stock options exercised             47,173
Benefit plans funded with treasury stock             455,291
Payments to acquire treasury stock             (287,108)
Stockholders' Equity Attributable to Parent, Ending Balance at Jun. 30, 2019 30,645,660 4,380,708 42,357,731 (1,287) 100,611,335 (425,971) 177,568,176
Stockholders' Equity Attributable to Parent, Beginning Balance at Mar. 31, 2019 30,625,374 4,380,722 42,190,568 (2,003) 97,131,281 (276,457) 174,049,485
Net earnings 0 0 0 0 3,480,054 0 3,480,054
Other comprehensive income, net of income tax 0 0 0 716   0 716
Share-based Payment Arrangement, Amount Capitalized 0 0 65,037 0 0 0 65,037
Proceeds from stock options exercised 20,274 0 9,519 0 0 0 29,793
Benefit plans funded with treasury stock 0 0 92,605 0 0 25,190 117,795
Payments to acquire treasury stock 0 0 0 0 0 (174,704) (174,704)
Conversion Class C to Class A 12 (14) 2 0 0 0 0
Stockholders' Equity Attributable to Parent, Ending Balance at Jun. 30, 2019 $ 30,645,660 $ 4,380,708 $ 42,357,731 $ (1,287) $ 100,611,335 $ (425,971) $ 177,568,176