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Note 13. Investments (Tables)
 3 Months Ended
Sep. 30, 2019
Investments [Abstract]  
Schedule of Contractual Maturities on Investments
The contractual maturities of our investment portfolio were as follows (maturity dates for municipal bonds are based on pre-refunded dates and maturity dates for government agency securities are based on the first available call date, if applicable): 
 
September 30, 2019
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Within one year
$
6,047

 
$
883

 
$
16,758

After one year through two years
2,745

 
—

 
—

Total Fair Value
$
8,792

 
$
883

 
$
16,758
Unrealized Gain (Loss) on Investments
 
September 30, 2019
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Amortized cost basis
$
8,792

 
$
883

 
$
16,734

Unrealized holding gains
—

 
—

 
24

Unrealized holding losses
—

 
—

 
—

Fair Value
$
8,792

 
$
883

 
$
16,758

 
 
 
 
 
 
 
June 30, 2019
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Amortized cost basis
$
11,230

 
$
1,921

 
$
19,888

Unrealized holding gains
—

 
1

 
31

Unrealized holding losses
—

 
—

 
—

Fair Value
$
11,230

 
$
1,922

 
$
19,919
Trading Securities (and Certain Trading Assets)
SERP asset and liability balances were as follows:
(Amounts in Thousands)
September 30,
2019
 
June 30,
2019
SERP investments - current asset
$
3,104

 
$
3,087

SERP investments - other long-term asset
8,934

 
8,687

    Total SERP investments
$
12,038

 
$
11,774

 
 
 
 
SERP obligation - current liability
$
3,104

 
$
3,087

SERP obligation - other long-term liability
8,934

 
8,687

    Total SERP obligation
$
12,038

 
$
11,774