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Stock-Based Compensation Plans (Schedule of Share-Based Compensation Expense) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | $ 1,046,516 | $ 1,485,898 | $ 1,364,698
Employee |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | 1,050,179 | 1,481,016 | 1,244,606
Nonemployee |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | (3,663) | 4,882 | 120,092
Employee, Nonemployee and Foundation Contribution |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | $ 1,046,516 | $ 1,485,898 | $ 1,364,698

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