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Note 11. Investments (Tables)
 6 Months Ended
Dec. 31, 2018
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): 
 
December 31, 2018
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Within one year
$
9,672

 
$
5,099

 
$
15,485

After one year through two years
2,965

 
904

 
7,951

Total Fair Value
$
12,637

 
$
6,003

 
$
23,436
Unrealized Gain (Loss) on Investments
 
December 31, 2018
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Amortized cost basis
$
12,637

 
$
6,009

 
$
23,456

Unrealized holding gains
—

 
—

 
1

Unrealized holding losses
—

 
(6
)
 
(21
)
Fair Value
$
12,637

 
$
6,003

 
$
23,436

 
 
 
 
 
 
 
June 30, 2018
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Amortized cost basis
$
11,850

 
$
16,532

 
$
6,266

Unrealized holding gains
—

 
—

 
—

Unrealized holding losses
—

 
(24
)
 
(17
)
Fair Value
$
11,850

 
$
16,508

 
$
6,249
Trading Securities (and Certain Trading Assets)
SERP asset and liability balances were as follows:
(Amounts in Thousands)
December 31,
2018
 
June 30,
2018
SERP investments - current asset
$
3,188

 
$
3,868

SERP investments - other long-term asset
8,237

 
8,246

    Total SERP investments
$
11,425

 
$
12,114

 
 
 
 
SERP obligation - current liability
$
3,188

 
$
3,868

SERP obligation - other long-term liability
8,237

 
8,246

    Total SERP obligation
$
11,425

 
$
12,114