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Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Computation for earnings per share
Net income	$ 37,074,497	$ 31,580,931	$ 22,154,828
Weighted average number of outstanding shares
Basic (in shares)	3,277,920	3,196,127	3,142,083
Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends	74,957	67,453	52,180
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6,909	2,588	0
Diluted (in shares)	3,359,786	3,266,168	3,194,263
Earnings per share
Basic (per share)	$ 11.31	$ 9.88	$ 7.05
Diluted (per share)	$ 11.03	$ 9.67	$ 6.94

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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