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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Continuing Operations     $ 7,026 $ 4,350 $ 4,962
Deferred Tax Expense from Stock Options Exercised     $ 1,900 1,100 1,200
Defined Contribution Plan Company Stock Held in Plan (in shares)     365,330    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 5,200    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 5 months 23 days    
Stock Reserved for Employee Stock Purchase Plan (in shares)     62,484    
Executive Compensation Plan [Member]          
Share-based Compensation Continuing Operations     $ 300 300 300
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Vested in Period Aggregate Intrinsic Value     (1,000) $ 900 $ 1,600
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 3 months 18 days    
Percent of Participants Annual Incentive Compensation Participants May Elect to Defer Maximum       50.00%  
Expiration of Restrictions on Units (Year)       3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)     32,387 34,950  
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)     11,132 7,698 5,622
Stock Issued During Period Average Price (in dollars per share)     $ 52.57 $ 65.63 $ 86.01
Restricted Stock [Member]          
Share-based Compensation Continuing Operations     $ 4,200 $ 3,700 $ 3,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     75,505 70,085 51,792
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)     $ 71.38 $ 102.74 $ 93.73
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Vested in Period Aggregate Intrinsic Value     $ (500) $ 900 $ 800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)     146,015 128,042  
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)     $ 74.37 $ 110.22 $ 96.56
Performance Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     42,976    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)     79,312 69,052  
Performance Stock Units [Member] | Executive Compensation Plan [Member]          
Share-based Compensation Continuing Operations     $ 2,900 $ 300 $ 900
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 $ 91.75
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 2,900    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 3 months 18 days