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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
--- | --- | --- | --- | --- | --- | --- | ---
Total stockholders' equity | $ 27,638,012 | $ 3,804,458 | $ 34,813,246 | $ 264,822 | $ 67,409,204 | $ (1,370,611) | $ 132,559,131
Stockholders' Equity Attributable to Parent, Beginning 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 | 0 | 0 | 0 | 0 | 1,860,000 | 0 | 1,860,000
Other comprehensive income, net of income tax | 0 | 0 | 0 | 21,292 | 0 | 0 | 21,292
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 0 | 0 | 101,996 | 0 | 0 | 0 | 101,996
Benefit plans funded with treasury stock | 0 | 0 | 178,002 | 0 | 0 | 146,065 | 324,067
Payments to acquire treasury stock | 0 | 0 | 0 | 0 | 0 | (185,470) | (185,470)
Stock dividends | 930 | 4 | 2,350 | 0 | (3,284) | 0 | 0
Conversion Class C to Class A | 1,214 | (1,214) | 0 | 0 | 0 | 0 | 0
Stockholders' Equity Attributable to Parent, Ending 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
Total stockholders' equity | 27,638,012 | 3,804,458 | 34,813,246 | 264,822 | 67,409,204 | (1,370,611) | 132,559,131
Stockholders' Equity Attributable to Parent, Beginning 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 |  |  |  |  |  |  | 5,442,702
Other comprehensive income, net of income tax |  |  |  |  |  |  | 71,809
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount |  |  |  |  |  |  | 305,741
Proceeds from stock options exercised |  |  |  |  |  |  | 0
Benefit plans funded with treasury stock |  |  |  |  |  |  | 1,149,968
Payments to acquire treasury stock |  |  |  |  |  |  | (185,470)
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2017 | 27,640,158 | 4,010,052 | 35,490,027 | 336,631 | 72,848,622 | (981,609) | 139,343,881
Total stockholders' equity | 27,638,012 | 3,804,458 | 34,813,246 | 264,822 | 67,409,204 | (1,370,611) | 132,559,131
Total stockholders' equity | 27,640,156 | 3,803,248 | 35,095,594 | 286,114 | 69,265,920 | (1,410,016) | 134,681,016
Stockholders' Equity Attributable to Parent, Beginning 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
Net earnings | 0 | 0 | 0 | 0 | 2,485,864 | 0 | 2,485,864
Other comprehensive income, net of income tax | 0 | 0 | 0 | (43,901) | 0 | 0 | (43,901)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 0 | 0 | 101,316 | 0 | 0 | 0 | 101,316
Proceeds from stock options exercised | 2 | 206,804 | (206,806) | 0 | 0 | 0 | 0
Benefit plans funded with treasury stock | 0 | 0 | 195,383 | 0 | 0 | 205,092 | 400,475
Stockholders' Equity Attributable to Parent, Ending Balance at Jun. 30, 2017 | 27,640,158 | 4,010,052 | 35,185,487 | 242,213 | 71,751,784 | (1,204,924) | 137,624,770
Total stockholders' equity | 27,640,156 | 3,803,248 | 35,095,594 | 286,114 | 69,265,920 | (1,410,016) | 134,681,016
Total stockholders' equity | 27,640,158 | 4,010,052 | 35,185,487 | 242,213 | 71,751,784 | (1,204,924) | 137,624,770
Net earnings | 0 | 0 | 0 | 0 | 1,096,838 | 0 | 1,096,838
Other comprehensive income, net of income tax | 0 | 0 | 0 | 94,418 | 0 | 0 | 94,418
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 0 | 0 | 102,429 | 0 | 0 | 0 | 102,429
Benefit plans funded with treasury stock | 0 | 0 | 202,111 | 0 | 0 | 223,315 | 425,426
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2017 | 27,640,158 | 4,010,052 | 35,490,027 | 336,631 | 72,848,622 | (981,609) | 139,343,881
Total stockholders' equity | 27,640,158 | 4,010,052 | 35,185,487 | 242,213 | 71,751,784 | (1,204,924) | 137,624,770
Total stockholders' equity | 27,640,158 | 4,010,052 | 35,490,027 | 336,631 | 72,848,622 | (981,609) | 139,343,881
Total stockholders' equity | 29,071,154 | 4,178,748 | 38,125,042 | 603,170 | 77,520,951 | (931,075) | 148,567,990
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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 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
Total stockholders' equity | 29,071,154 | 4,178,748 | 38,125,042 | 603,170 | 77,520,951 | (931,075) | 148,567,990
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 |  |  |  |  |  |  | 22,177,886
Other comprehensive income, net of income tax |  |  |  |  |  |  | (687)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount |  |  |  |  |  |  | 174,831
Proceeds from stock options exercised |  |  |  |  |  |  | 57,412
Benefit plans funded with treasury stock |  |  |  |  |  |  | 1,108,583
Payments to acquire treasury stock |  |  |  |  |  |  | (54,507)
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2018 | 29,147,316 | 4,178,368 | 38,711,180 | (687) | 100,293,129 | (297,798) | 172,031,508
Total stockholders' equity | 29,071,154 | 4,178,748 | 38,125,042 | 603,170 | 77,520,951 | (931,075) | 148,567,990
Total stockholders' equity | 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 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 | (1,448)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 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
Total stockholders' equity | 29,138,642 | 4,178,744 | 38,255,340 | 0 | 95,041,166 | (708,665) | 165,905,227
Total stockholders' equity | 29,139,018 | 4,178,368 | 38,476,728 | (1,448) | 98,279,383 | (486,245) | 169,585,804
Net earnings | 0 | 0 | 0 | 0 | 2,013,746 | 0 | 2,013,746
Other comprehensive income, net of income tax | 0 | 0 | 0 | 761 |  | 0 | 761
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 0 | 0 | 58,691 | 0 | 0 | 0 | 58,691
Proceeds from stock options exercised | 8,298 | 0 | 7,261 | 0 | 0 | 0 | 15,559
Benefit plans funded with treasury stock | 0 | 0 | 168,500 | 0 | 0 | 242,954 | 411,454
Payments to acquire treasury stock | 0 | 0 | 0 | 0 | 0 | (54,507) | (54,507)
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2018 | 29,147,316 | 4,178,368 | 38,711,180 | (687) | 100,293,129 | (297,798) | 172,031,508
Total stockholders' equity | 29,139,018 | 4,178,368 | 38,476,728 | (1,448) | 98,279,383 | (486,245) | 169,585,804
Total stockholders' equity | $ 29,147,316 | $ 4,178,368 | $ 38,711,180 | $ (687) | $ 100,293,129 | $ (297,798) | $ 172,031,508

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