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Securities (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale securities |  |
Amortized Cost | $ 58,789 | $ 58,789
Carrying Value / Estimated Fair Value | 4,707,085 | 5,403,463
Available-for-sale Securities | Common Shares of CV Holdings, Inc. |  |
Available-for-sale securities |  |
Amortized Cost | 58,789 | 58,789
Cumulative Unrealized Gain | 205,764 | 558,499
Carrying Value / Estimated Fair Value | $ 264,553 | $ 617,288
Number of shares of common stock purchased | 2,939,465 | 2,939,465

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