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Fair Value Measures and Disclosures (Tables)
3 Months Ended
Sep. 30, 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
September 30, 2021   
Financial Assets:
 Certificates of Deposit$ $1,200 $ $1,200 
Financial Liabilities:
Revolving credit facility
$ $65,000 $ $65,000 
June 30, 2021   
Financial Assets:
 Certificates of Deposit$— $1,200 $— $1,200 
Financial Liabilities:
Revolving credit facility
$ $100,000 $ $100,000