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Note 11. Investments (Tables)
 9 Months Ended
Mar. 31, 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): 
 
March 31, 2019
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Within one year
$
9,172

 
$
2,445

 
$
23,335

After one year through two years
4,465

 
—

 
2,404

Total Fair Value
$
13,637

 
$
2,445

 
$
25,739
Unrealized Gain (Loss) on Investments
 
March 31, 2019
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
U.S. Treasury and Federal Agencies
Amortized cost basis
$
13,637

 
$
2,446

 
$
25,737

Unrealized holding gains
—

 
—

 
7

Unrealized holding losses
—

 
(1
)
 
(5
)
Fair Value
$
13,637

 
$
2,445

 
$
25,739

 
 
 
 
 
 
 
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)
March 31,
2019
 
June 30,
2018
SERP investments - current asset
$
3,409

 
$
3,868

SERP investments - other long-term asset
9,096

 
8,246

    Total SERP investments
$
12,505

 
$
12,114

 
 
 
 
SERP obligation - current liability
$
3,409

 
$
3,868

SERP obligation - other long-term liability
9,096

 
8,246

    Total SERP obligation
$
12,505

 
$
12,114