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Note 14. Investments (Tables)
 6 Months Ended
Dec. 31, 2020
Investments [Abstract]  
Schedule of Contractual Maturities on Investments The contractual maturities of our investment portfolio were as follows: 
 December 31, 2020
(Amounts in Thousands)Certificates of Deposit
Within one year$1,505 
After one year through two years— 
Total Fair Value$1,505 
Unrealized Gain (Loss) on Investments
December 31, 2020
(Amounts in Thousands)Certificates of Deposit
Amortized cost basis$1,500 
Unrealized holding gains5 
Unrealized holding losses— 
Fair Value$1,505 
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)December 31,
2020		June 30,
2020
SERP investments - current asset$3,284 $3,622 
SERP investments - other long-term asset10,168 8,353 
    Total SERP investments$13,452 $11,975 
SERP obligation - current liability$3,284 $3,622 
SERP obligation - other long-term liability10,168 8,353 
    Total SERP obligation$13,452 $11,975