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Note 9. Investments (Tables)
 3 Months Ended
Sep. 30, 2017
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): 
 
September 30, 2017
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
Government Agency Securities
Within one year
$
9,258

 
$
13,573

 
$
3,194

After one year through two years
1,904

 
5,599

 
—

Total Fair Value
$
11,162

 
$
19,172

 
$
3,194
Unrealized Gain (Loss) on Investments
 
September 30, 2017
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
Government Agency Securities
Amortized cost basis
$
11,161

 
$
19,187

 
$
3,200

Unrealized holding gains
1

 
—

 
—

Unrealized holding losses
—

 
(15
)
 
(6
)
Fair Value
$
11,162

 
$
19,172

 
$
3,194

 
 
 
 
 
 
 
June 30, 2017
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
 
Government Agency Securities
Amortized cost basis
$
10,334

 
$
22,183

 
$
3,200

Unrealized holding gains
2

 
—

 
—

Unrealized holding losses
—

 
(29
)
 
(7
)
Fair Value
$
10,336

 
$
22,154

 
$
3,193
Trading Securities (and Certain Trading Assets)
SERP asset and liability balances were as follows:
(Amounts in Thousands)
September 30,
2017
 
June 30,
2017
SERP investments - current asset
$
2,733

 
$
1,259

SERP investments - other long-term asset
9,135

 
9,935

    Total SERP investments
$
11,868

 
$
11,194

 
 
 
 
SERP obligation - current liability
$
2,733

 
$
1,259

SERP obligation - other long-term liability
9,135

 
9,935

    Total SERP obligation
$
11,868

 
$
11,194