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Derivative Instruments and Hedging Activities - Effects on statements of income and consolidated statements of comprehensive income (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain Recognized in (Loss) Income | $ 863,972 | $ (349,618) | $ 1,253,059 | $ (119,752) |
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Derivatives Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain Recognized in (Loss) Income | (863,972) | 0 | (986,645) | 0 |
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Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain Recognized in (Loss) Income | $ 0 | $ 349,618 | $ (266,414) | $ 119,752 |