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Earnings Per Common Share And Share Awards (Tables) | 9 Months Ended
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Sep. 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 nine-month periods ended September 30:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
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 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 |
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 September 30, 2017 | 25,000 |  |  | $ | 93.40 |  |  | 4.23 |  | $ | 2,203,100 |
Exercisable as of September 30, 2017 | 22,750 |  |  | $ | 83.58 |  |  | 4.00 |  | $ | 2,203,100 |
Unvested as of September 30, 2017 | 2,250 |  |  | $ | 192.71 |  |  | 6.63 |  | $ | — |
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 for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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