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Stock Compensation (Details Textual) | 12 Months Ended
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Feb. 28, 2017 USD ($) share_based_compensation_plan $ / shares shares | Feb. 29, 2016 USD ($) $ / shares shares | Feb. 28, 2015 USD ($) $ / shares shares | Feb. 29, 2012 shares
Share Based Compensation (Textual) [Abstract] |  |  |  |
Number of share-based compensation plans | share_based_compensation_plan | 1 |  |  |
Shares authorized (shares) | shares | 1,500,000 |  |  |
Share for future issuance (shares) | shares | 1,270,511 |  |  |
Unrecognized compensation cost | $ 6,764,700 |  |  |
Unrecongized compensation cost, amortization period | 1 year 10 months 28 days |  |  |
Tax benefits from stock options exercised | $ 0 | $ 1,025,000 | $ 259,000 |
Employee Stock Purchase Plan [Member] |  |  |  |
Share Based Compensation (Textual) [Abstract] |  |  |  |
Granted option lower than | 85.00% |  |  |
Restricted common stock under plan | $ 25,000 |  |  |
Common stock purchased during period (shares) | shares | 5,000 |  |  |
Directors Grants [Member] |  |  |  |
Share Based Compensation (Textual) [Abstract] |  |  |  |
Shares of company common stock (shares) | shares | 1,641 | 1,915 | 2,000 | 1,000
Value of common stock grants (usd per share) | $ / shares | $ 60.94 | $ 52.21 | $ 44.90 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share Based Compensation (Textual) [Abstract] |  |  |  |
Vesting ratably term | 3 years |  |  |
Total fair value of vested shares | $ 1,618,996 | $ 897,712 | $ 818,519 |
Non-vested shares outstanding (shares) | shares | 134,547 | 98,693 | 77,446 |
Non-vested shares outstanding, weighted average grant date fair value (usd per share) | $ / shares | $ 51.100 | $ 45.030 | $ 41.310 |
Stock Appreciation Rights (SARs) [Member] |  |  |  |
Share Based Compensation (Textual) [Abstract] |  |  |  |
Vesting ratably term | 3 years |  |  |
Term for the contract | 7 years |  |  |
Outstanding average contractual term | 3 years 6 months 7 days |  |  |
Outstanding aggregate intrinsic value | $ 2,800,000 |  |  |
Average remaining contractual term | 3 years 4 months 17 days |  |  |
Aggregate remaining intrinsic value | $ 2,200,000 |  |  |

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- Definition Share based compensation arrangement by share based payment award equity instruments options and other than options outstanding weighted average remaining contractual terms. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options and other than options exercisable intrinsic value1. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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