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Note 9. Investments (Tables)
 6 Months Ended
Dec. 31, 2016
Investments [Abstract]  
Schedule of Contractual Maturities on Investments
The contractual maturities, or municipal bond pre-refunded dates if applicable, of the Company’s investment portfolio were as follows: 
 
December 31, 2016
(Amounts in Thousands)
Certificates of Deposit
Municipal Bonds
Within one year
$
5,975

$
4,245

After one year through two years
3,422

5,163

Total Fair Value
$
9,397

$
9,408
Unrealized Gain (Loss) on Investments
 
December 31, 2016
(Amounts in Thousands)
Certificates of Deposit
 
Municipal Bonds
Amortized cost basis
$
9,392

 
$
9,445

Unrealized holding gains
5

 
—

Unrealized holding losses
—

 
(37
)
Fair Value
$
9,397

 
$
9,408
Trading Securities (and Certain Trading Assets)
SERP asset and liability balances were as follows:
(Amounts in Thousands)
December 31,
2016
 
June 30,
2016
SERP investments - current asset
$
669

 
$
768

SERP investments - other long-term asset
9,879

 
9,233

    Total SERP investments
$
10,548

 
$
10,001

 
 
 
 
SERP obligation - current liability
$
669

 
$
768

SERP obligation - other long-term liability
9,879

 
9,233

    Total SERP obligation
$
10,548

 
$
10,001