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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