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Fair Value Measures and Disclosures (Tables)
9 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measurements[Table Text Block]
Fair value of financial assets included in current assets is as follows:
Estimated Fair Value MeasurementsTotal Fair
 Level 1Level 2Level 3Value
March 31, 2021   
Financial Assets:
 Certificates of Deposit$ $6,200 $ $6,200 
June 30, 2020   
Financial Assets:
 Certificates of Deposit$— $— $— $