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STOCK BASED COMPENSATION PLANS - Unrecognized Stock-based Compensation Expense (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2019
USD ($)
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized expense $ 895
Weighted average recognition period 2 years 2 months
Stock grants  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized expense $ 217
Weighted average recognition period 1 year