Note 8. Fair Value - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 |
Recurring Fair Value Measurements: | | |
Trading Securities: Mutual funds in nonqualified SERP | $ 11,868 | $ 11,194 |
Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Total assets at fair value | 107,075 | 107,862 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Total assets at fair value | 45,211 | 41,577 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Total assets at fair value | 60,364 | 64,785 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Total assets at fair value | 1,500 | 1,500 |
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 11,162 | 10,336 |
Warrant | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Derivative Asset, Fair Value, Gross Asset | 1,500 | 1,500 |
Warrant | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 |
Warrant | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 |
Warrant | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Derivative Asset, Fair Value, Gross Asset | 1,500 | 1,500 |
Mutual Fund | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Trading Securities: Mutual funds in nonqualified SERP | 11,868 | 11,194 |
Mutual Fund | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Trading Securities: Mutual funds in nonqualified SERP | 11,868 | 11,194 |
Mutual Fund | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Trading Securities: Mutual funds in nonqualified SERP | 0 | 0 |
Mutual Fund | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Trading Securities: Mutual funds in nonqualified SERP | 0 | 0 |
Money Market Funds | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 33,343 | 30,383 |
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 33,343 | 30,383 |
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 0 | 0 |
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 0 | 0 |
Commercial Paper | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 26,836 | 29,102 |
Commercial Paper | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 0 | 0 |
Commercial Paper | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 26,836 | 29,102 |
Commercial Paper | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Cash equivalents | 0 | 0 |
Certificates of Deposit | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 11,162 | 10,336 |
Certificates of Deposit | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 11,162 | 10,336 |
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 0 | 0 |
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 0 | 0 |
Municipal Bonds | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 19,172 | 22,154 |
Municipal Bonds | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 19,172 | 22,154 |
Municipal Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 0 | 0 |
Municipal Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 19,172 | 22,154 |
Municipal Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 0 | 0 |
Government Agencies | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 3,194 | 3,193 |
Government Agencies | Fair Value, Measurements, Recurring | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 3,194 | 3,193 |
Government Agencies | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 0 | 0 |
Government Agencies | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | 3,194 | 3,193 |
Government Agencies | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | | |
Recurring Fair Value Measurements: | | |
Available-for-sale Securities | $ 0 | $ 0 |