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Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 12,685,826us-gaap_ProfitLoss	$ 21,217,193us-gaap_ProfitLoss	$ 28,958,487us-gaap_ProfitLoss
Other comprehensive loss
Effective portion of changes in fair value of interest swap contracts	(293,020)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification adjustment	49,471us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	(67,849)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	(54,340)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other comprehensive loss	(243,549)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(67,849)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(54,340)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 12,442,277us-gaap_ComprehensiveIncomeNetOfTax	$ 21,149,344us-gaap_ComprehensiveIncomeNetOfTax	$ 28,904,147us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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