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Note 13. Investments - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Certificates of Deposit    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 5,970 $ 11,230
Available-for-sale Securities, Unrealized holding gains 0 0
Available-for-sale Securities, Unrealized holding losses 0 0
Fair Value, Available-for-sale Securities 5,970 11,230
Municipal Bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 875 1,921
Available-for-sale Securities, Unrealized holding gains 0 1
Available-for-sale Securities, Unrealized holding losses 0 0
Fair Value, Available-for-sale Securities 875 1,922
US Treasury and Federal Agency Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 18,791 19,888
Available-for-sale Securities, Unrealized holding gains 12 31
Available-for-sale Securities, Unrealized holding losses 0 0
Fair Value, Available-for-sale Securities $ 18,803 $ 19,919