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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Components of Provision For Income Taxes | The components of the provision for income taxes are as follows:
| 2021 |  | 2020 |  | 2019
Currently payable: |  |  |  |  |
Federal | $ | 89,507,896 |  |  | $ | 67,606,617 |  |  | $ | 73,563,685 |
State | 5,642,926 |  |  | 10,180,218 |  |  | 3,765,929 |
Foreign | 2,098,433 |  |  | 1,882,195 |  |  | 1,468,018 |
Total | 97,249,255 |  |  | 79,669,030 |  |  | 78,797,632 |
Deferred income tax benefit: |  |  |  |  |
Primarily federal | (41,694,751) |  |  | (15,419,722) |  |  | (3,066,237) |
Provision for income taxes | $ | 55,554,504 |  |  | $ | 64,249,308 |  |  | $ | 75,731,395 |
Schedule of Effective Income Tax Rates Different from Statutory Federal Income Tax Rates | The effective income tax rates are different from the statutory federal income tax rates for the following reasons:
| 2021 |  | 2020 |  | 2019
Statutory federal income tax rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income taxes, net of federal income tax benefit | 0.7 |  |  | 2.1 |  |  | 0.6 |
Research tax credit | (1.0) |  |  | (1.4) |  |  | (1.1) |
Increase (Decrease) in reserve for uncertain tax provisions | 0.1 |  |  | (0.1) |  |  | 0.3 |
Foreign tax credit | (0.2) |  |  | (0.1) |  |  | (0.1) |
Foreign derived intangible income deduction | (6.3) |  |  | (5.2) |  |  | (4.8) |
Stock compensation | (1.3) |  |  | (1.0) |  |  | (1.1) |
Other | 0.3 |  |  | 0.3 |  |  | 0.3 |
Effective income tax rate | 13.3 | % |  | 15.6 | % |  | 15.1 | %
Schedule of Deferred Income Tax Assets And Liabilities | The tax effect of temporary differences which give rise to deferred income tax assets and liabilities at December 31, 2021 and 2020, are as follows:
| December 31,
| 2021 |  | 2020
Assets: |  |  |
Accruals not currently deductible | $ | 12,823,493 |  |  | $ | 13,135,048 |
Research and development costs | 49,099,538 |  |  | 13,371,625 |
Stock based compensation | 13,707,737 |  |  | 11,983,900 |
Other | 2,118,484 |  |  | 1,163,204 |
Total deferred income tax assets | $ | 77,749,252 |  |  | $ | 39,653,777 |
Liabilities: |  |  |
Excess tax over book depreciation | $ | (20,728,577) |  |  | $ | (29,977,693) |
Goodwill | (37,999,022) |  |  | (33,427,901) |
Intangible assets | (11,718,904) |  |  | (11,237,588) |
Other | (2,507,071) |  |  | (3,971,338) |
Total deferred income tax liabilities | $ | (72,953,574) |  |  | $ | (78,614,520) |
Net deferred income taxes | $ | 4,795,678 |  |  | $ | (38,960,743) |
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2021 |  | 2020 |  | 2019
Beginning of year | $ | 4,864,000 |  |  | $ | 6,392,000 |  |  | $ | 4,678,000 |
Additions based on tax positions related to the current year | 1,023,000 |  |  | 918,000 |  |  | 1,695,000 |
Additions for tax positions in prior years | 364,000 |  |  | 770,000 |  |  | 657,000 |
Reductions for tax positions in prior years | (51,000) |  |  | (2,907,000) |  |  | (38,000) |
Reductions as a result of a lapse of the applicable statute of limitations | (925,000) |  |  | (309,000) |  |  | (600,000) |
End of year | $ | 5,275,000 |  |  | $ | 4,864,000 |  |  | $ | 6,392,000 |

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