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Note 13 - Stock-based Compensation and Purchase Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Jul. 01, 2005 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Continuing Operations |  |  | $ 8,368 | $ 7,026 | $ 4,350
Deferred Tax Expense from Stock Options Exercised |  |  | $ 1,800 | 1,900 | 1,100
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 208,971 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 3,700 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 4 months 17 days |  |
Stock Reserved for Employee Stock Purchase Plan (in shares) |  |  | 54,975 |  |
Executive Compensation Plan [Member] |  |  |  |  |
Share-based Compensation Continuing Operations |  |  | $ 400 | $ 300 | $ 300
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 400 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 4 months 24 days |  |
Percent of Participants Annual Incentive Compensation Participants May Elect to Defer Maximum |  |  | 50.00% |  |
Expiration of Restrictions on Units (Year) |  |  | 3 years |  |
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% |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date | 15.00% | 5.00% |  |  |
Percent of Fair Market Value at Which Employees May Purchase Shares of Stock | 85.00% |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  | 7,509 | 11,132 | 7,698
Stock Issued During Period Average Price (in dollars per share) |  |  | $ 66.98 | $ 52.57 | $ 65.63
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Continuing Operations |  |  | $ 5,300 | $ 4,200 | $ 3,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 59.57 | $ 71.38 | $ 102.74
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 2,800 | $ 2,300 | $ 4,500
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 (in dollars per share) |  |  | $ 43.16 | $ 74.37 | $ 110.22
Performance Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 58.81 |  |
Performance Stock Units [Member] | Executive Compensation Plan [Member] |  |  |  |  |
Share-based Compensation Continuing Operations |  |  | $ 2,600 | $ 2,900 | $ 300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 70.37 | $ 106.65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | 700 | $ 800 | $ 700
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 3,600 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 3 months 18 days |  |

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