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Earnings Per Common Share And Share Awards (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the three- and six-month periods ended June 30:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net income attributable to the Company | $ | 5,675,192 |  |  | $ | 4,529,380 |  |  | $ | 10,151,247 |  |  | $ | 6,343,420 |
Weighted average common shares outstanding – Basic | 1,886,735 |  |  | 1,923,213 |  |  | 1,886,161 |  |  | 1,928,766 |
Incremental shares outstanding assuming the exercise of dilutive SARs (share-settled) | 9,846 |  |  | 5,412 |  |  | 9,679 |  |  | 6,559 |
Weighted average common shares outstanding – Diluted | 1,896,581 |  |  | 1,928,625 |  |  | 1,895,840 |  |  | 1,935,325 |
Basic earnings per common share | $ | 3.01 |  |  | $ | 2.36 |  |  | $ | 5.38 |  |  | $ | 3.29 |
Diluted earnings per common share | $ | 2.99 |  |  | $ | 2.35 |  |  | $ | 5.35 |  |  | $ | 3.28 |
Summary Of Share-Based Award Transactions | A summary of share-based award transactions for all share-based award plans follows:
| Number Of Shares |  | Weighted Average Exercise Price |  | Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2016 | 22,000 |  |  | $ | 57.04 |  |  | 3.93 |  | $ | 945,055 |
SARs granted | 4,500 |  |  | 93.87 |  |  |  |  |  |
SARs exercised | (2,000 | ) |  | 32.00 |  |  |  |  |  |
Outstanding as of December 31, 2016 | 24,500 |  |  | $ | 65.85 |  |  | 3.85 |  | $ | 836,640 |
SARs granted | 4,500 |  |  | 192.71 |  |  |  |  |  |
SARs exercised | (4,000 | ) |  | 36.38 |  |  |  |  |  |
Outstanding as of June 30, 2017 | 25,000 |  |  | $ | 93.40 |  |  | 4.49 |  | $ | 2,500,970 |
Exercisable as of June 30, 2017 | 21,625 |  |  | $ | 77.90 |  |  | 4.11 |  | $ | 2,498,506 |
Unvested as of June 30, 2017 | 3,375 |  |  | $ | 192.71 |  |  | 6.88 |  | $ | 2,464 |
Share-Based Valuation Assumptions | The weighted average fair values for the SARs issued during 2017 and 2016 were $55.40 and $28.75, respectively, and were estimated using the weighted average assumptions shown in the table below.
| 2017 |  | 2016
Expected Life in Years | 7.0 |  | 7.0
Volatility | 26.2% |  | 28.9%
Interest Rate | 2.0% |  | 1.7%
Yield Rate | 1.0% |  | 1.0%

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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