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Summary of Significant Accounting and Reporting Policies (Schedule Of Allowance For Doubtful Accounts) (Details) - Allowance for Doubtful Accounts - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Activity in the Company’s allowance for doubtful accounts |  |  |
Beginning Balance | $ 2,746,647 | $ 2,714,533 | $ 2,917,424
Net Additions/ (Reductions) to Costs and Expenses | 0 | 0 | 0
Deductions and Other Adjustments | (295,354) | 32,114 | (202,891)
Ending Balance | $ 2,451,293 | $ 2,746,647 | $ 2,714,533

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