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Summary of Significant Accounting Policies - Debt (Details) - Senior Notes [Member] - USD ($) | Feb. 28, 2018 | Feb. 28, 2017 | Jan. 21, 2011
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Unsecured Senior Notes Due March 31, 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fair value of notes | $ 133,659,750 | $ 144,350,531 |
Unsecured Senior Notes Due January 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  |  | $ 125,000,000

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