Note 6. Long-Term Debt and Credit Facilities - Textuals (Details)	12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Credit Facility, Borrowings Outstanding	$ 0	$ 0
Long-term debt, less current maturities	212,000	241,000
Current maturities of long-term debt	29,000	27,000
Maturities of Long-Term Debt in the Next Twelve Months	29,000
Maturities of Long-term Debt in Year Two	27,000
Maturities of Long-term Debt in Year Three	23,000
Maturities of Long-term Debt in Year Four	25,000
Maturities of Long-term Debt in Year Five	27,000
Aggregate Maturities of Long-term Debt after Year Five	110,000
Credit Facility, Maximum Borrowing Capacity	30,000,000
Credit Facility, Maximum Borrowing Capacity Upon Request	55,000,000
Credit Facility, Availability to Borrow	28,600,000
Line of Credit Facility, Amount Available for Letters of Credit	10,000,000
Adjusted Leverage Ratio, Indebtedness Reduction For Excess Cash	$ 15,000,000
Adjusted Leverage Ratio Covenant	3.0
Fixed Charge Coverage Ratio Covenant, Percent of Depreciation	50.00%
Fixed Charge Coverage Ratio Covenant	1.10
Interest Paid on Borrowings	$ 22,000	$ 29,000	$ 29,000
Minimum
Interest Rate on Long-Term Debt	2.50%
Line of Credit Facility, Commitment Fee Basis Points	20.0
Maximum
Interest Rate on Long-Term Debt	9.25%
Line of Credit Facility, Commitment Fee Basis Points	25.0
Financial Standby Letter of Credit
Letters of Credit, Amount	$ 1,400,000
Eurocurrency Loans Margin | Minimum
Line of Credit Facility, Interest Rate Basis Points	125.0
Eurocurrency Loans Margin | Maximum
Line of Credit Facility, Interest Rate Basis Points	175.0
London Interbank Offered Rate (LIBOR) | Primary Revolving Credit Facility
Interest Rate Charged Over Index Rate	1.00%
Federal Funds Rate
Interest Rate Charged Over Index Rate	0.50%
Alternate Base Rate Loans Spread | Minimum
Line of Credit Facility, Interest Rate Basis Points	25.0
Alternate Base Rate Loans Spread | Maximum
Line of Credit Facility, Interest Rate Basis Points	75.0