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Unaudited Condensed Consolidated Statements of Income - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Income Statement [Abstract] |  |  |
NET SALES |  | $ 453,761,726 | $ 468,588,997
COST OF GOODS SOLD |  | 297,174,245 | 298,944,494
Gross profit |  | 156,587,481 | 169,644,503
OPERATING EXPENSES: |  |  |
Engineering, research and development |  | 29,615,422 | 28,089,181
Selling, general & administrative |  | 21,944,892 | 19,958,991
Total operating expenses |  | 51,560,314 | 48,048,172
Income from operations |  | 105,027,167 | 121,596,331
OTHER INCOME (LOSS) |  |  |
Investment income |  | 2,446,649 | 3,262,741
Other income (loss), net |  | (199,167) | 49,469
Total other income |  | 2,247,482 | 3,312,210
INCOME BEFORE PROVISION FOR INCOME TAXES |  | 107,274,649 | 124,908,541
PROVISION FOR INCOME TAXES |  | 17,768,848 | 20,628,130
NET INCOME |  | $ 89,505,801 | $ 104,280,411
EARNINGS PER SHARE: |  |  |
Basic (in dollars per share) | [1] | $ 0.36 | $ 0.40
Diluted (in dollars per share) | [1] | 0.36 | 0.40
Cash Dividends Declared per Share (in dollars per share) |  | $ 0.12 | $ 0.115
[1] | (1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards.

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