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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Activity in the Company’s allowance for doubtful accounts |  |  |
Beginning Balance | $ 2,663,477 | $ 2,711,248 | $ 3,202,388
Net Additions/ (Reductions) to Costs and Expenses | 0 | 0 | (300,000)
Deductions and Other Adjustments | 253,947 | (47,771) | (191,140)
Ending Balance | $ 2,917,424 | $ 2,663,477 | $ 2,711,248

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