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Capital Notes (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 25, 2017
Debt Instrument [Line Items] |  |  |  |
Capital note proceeds |  |  | $ 5,000,000 |
Capital Notes 4% Due 1/24/2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital notes, interest rate | 4.00% | 4.00% |  |
Capital notes, maturity date |  | Jan. 24, 2022 |  |
Capital Notes 4% Due 1/24/2022 [Member] | 2017 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital note issued |  |  |  | $ 5,000,000
Capital notes, interest rate |  |  |  | 4.00%
Capital notes, maturity date |  | Jan. 24, 2022 |  |
Duration of written notice to holders |  | 30 days |  |
Capital Notes 4% Due 1/24/2022 [Member] | Equity Capital [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital note proceeds | $ 3,000,000 |  |  |
Capital Notes 4% Due 1/24/2022 [Member] | Debt Services [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital note proceeds |  | $ 2,000,000 |  |

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