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STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Nov. 30, 2015
Stock-based compensation        
Common stock authorized for future grants (in shares)       2,500,000
Stock-based compensation expense $ 9,116 $ 6,617 $ 8,279  
Contractual term of awards 10 years      
Minimum        
Stock-based compensation        
Continuous service period for awards to vest 1 year      
Maximum        
Stock-based compensation        
Continuous service period for awards to vest 3 years      
Stock options        
Stock-based compensation        
Stock-based compensation expense $ 163 $ 221 $ 318  
Stock options granted (in shares) 1,604      
Unrecognized compensation expense $ 100      
Weighted-average vesting period (years) 1 year 6 months      
Key assumptions used in Black-Scholes model to determine the fair value of each stock option and SAR        
Weighted-average expected volatility (as a percent) 34.40% 36.50% 42.20%  
Weighted-average expected life (in years) 4 years 6 months 4 years 6 months 5 years 6 months  
Weighted-average dividend yield (as a percent) 1.00% 1.10% 1.10%  
Weighted-average risk free interest rate (as a percent) 1.60% 2.70% 1.80%  
Stock appreciation rights        
Stock-based compensation        
Stock-based compensation expense $ 2,545 $ 2,025 $ 1,988  
Other than options granted (in shares) 53,616      
Unrecognized compensation expense $ 1,500      
Weighted-average vesting period (years) 1 year 10 months 24 days      
Key assumptions used in Black-Scholes model to determine the fair value of each stock option and SAR        
Weighted-average expected volatility (as a percent) 34.60% 37.60% 42.40%  
Weighted-average expected life (in years) 4 years 8 months 12 days 5 years 2 months 12 days 5 years 4 months 24 days  
Weighted-average dividend yield (as a percent) 1.00% 1.10% 1.10%  
Weighted-average risk free interest rate (as a percent) 1.60% 2.70% 1.80%  
Restricted stock        
Stock-based compensation        
Stock-based compensation expense $ 5,117 $ 3,336 $ 4,487  
Other than options granted (in shares) 26,026      
Unrecognized compensation expense $ 3,300      
Weighted-average vesting period (years) 3 years 1 month 6 days      
Performance stock        
Stock-based compensation        
Stock-based compensation expense $ 1,291 $ 1,035 $ 1,486  
Other than options granted (in shares) 32,840      
Earn out basis if all goals are met (as a percent) 200.00%      
Unrecognized compensation expense $ 1,500      
Weighted-average vesting period (years) 2 years 2 months 12 days      
Continuous service period for awards to vest 3 years