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Note 13 - Stock-based Compensation and Purchase Plans (Details Textual) - USD ($) | 12 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Restricted Stock [Member] | Executive Compensation Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 82.79 | $ 80.98 | $ 69.47
Restricted Stock [Member] |  |  |
Share-based Compensation Continuing Operations | $ 2,600,000 | $ 2,300,000 | $ 3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 48,984 | 43,598 | 62,698
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 77.38 | $ 76.47 | $ 58.84
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Vested in Period Aggregate Intrinsic Value | $ 1,069,817 | $ 2,800,000 | $ 3,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 3,100,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 178 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 104,525 | 105,079 |
Performance Stock Units [Member] | Executive Compensation Plan [Member] |  |  |
Share-based Compensation Continuing Operations | $ 2,300,000 | $ 1,300,000 | $ 2,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 76.61 | $ 74.82 | $ 54.48
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 1,600,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 109 days |  |
Performance Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 34,124 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 54,736 | 28,450 |
Executive Compensation Plan [Member] | Minimum [Member] |  |  |
Shares of Common Stock Issued Determined by Adjustment of Target Range Percent | 50.00% |  |
Executive Compensation Plan [Member] | Maximum [Member] |  |  |
Shares of Common Stock Issued Determined by Adjustment of Target Range Percent | 200.00% |  |
Executive Compensation Plan [Member] |  |  |
Share-based Compensation Continuing Operations | $ 200,000 | $ 300,000 | $ 700,000
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Vested in Period Aggregate Intrinsic Value | 2,300,000 | $ 1,500,000 | $ 2,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 300,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 102 days |  |
Percent of Participants Annual Incentive Compensation Participants May Elect to Defer Maximum | 50.00% |  |
Expiration of Restrictions on Units | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 30,597 | 43,549 |
Employee Stock Purchase Plan [Member] |  |  |
Percent of Fair Market Value at Which Employees May Purchase Shares of Stock | 95.00% |  |
Stock Reserved for Employee Stock Purchase Plan | 90,679 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 3,809 | 3,382 | 4,473
Stock Issued During Period Average Price | $ 75.66 | $ 74.42 | $ 58.54
Share-based Compensation Continuing Operations | $ 5,089,000 | $ 3,764,000 | $ 6,630,000
Deferred Tax Expense from Stock Options Exercised | $ 1,800,000 | $ 1,300,000 | $ 2,300,000
Common Stock, Capital Shares Reserved for Future Issuance | 319,211 |  |

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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 The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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