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Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 5,926,457	$ 8,126,939	$ 16,077,704	$ 14,470,359
Weighted average common shares outstanding - Basic	1,887,103	1,888,870	1,886,474	1,915,468
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	9,126	6,722	9,483	6,531
Weighted average common shares outstanding - Diluted	1,896,229	1,895,592	1,895,957	1,921,999
Basic Earnings per Common Share	$ 3.14	$ 4.30	$ 8.52	$ 7.55
Diluted Earnings per Common Share	$ 3.13	$ 4.29	$ 8.48	$ 7.53

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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