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Investments (Tables)
 9 Months Ended
Mar. 31, 2021
Investments [Abstract]  
Schedule of Contractual Maturities on Investments The contractual maturities of our investment portfolio were as follows: 
 March 31, 2021
(Amounts in Thousands)Certificates of Deposit
Within one year$501 
After one year through two years— 
Total Fair Value$501 
Unrealized Gain (Loss) on Investments
March 31, 2021
(Amounts in Thousands)Certificates of Deposit
Amortized cost basis$500 
Unrealized holding gains1 
Unrealized holding losses— 
Fair Value$501 
June 30, 2020
(Amounts in Thousands)Certificates of Deposit
Amortized cost basis$5,250 
Unrealized holding gains44 
Unrealized holding losses— 
Fair Value$5,294 
Trading Securities (and Certain Trading Assets)
SERP asset and liability balances were as follows:
(Amounts in Thousands)March 31,
2021		June 30,
2020
SERP investments - current asset$3,463 $3,622 
SERP investments - other long-term asset10,123 8,353 
    Total SERP investments$13,586 $11,975 
SERP obligation - current liability$3,463 $3,622 
SERP obligation - other long-term liability10,123 8,353 
    Total SERP obligation$13,586 $11,975