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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 | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Amount of Gain Recognized in (Loss) Income | $ 124,980 | $ (59,061) | $ 1,378,039 | $ (178,813) |
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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 | (124,980) | 0 | (1,111,625) | 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 | $ 59,061 | $ (266,414) | $ 178,813 |