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Note 14. Stock Compensation - Stock Compensation Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Stock based Compensation Expense $ 1.7   $ 1.0 $ 3.6 $ 2.5
Tax benefit for stock compensation arrangements $ 0.4   $ 0.3 $ 0.9 $ 1.4
Excess tax benefits from stock award vesting   $ 0.6      
Minimum          
Annual Performance Shares, Earned Percentage 0.00%     0.00%  
Relative Total Shareholder Return, Earned Percentage 0.00%     0.00%  
Maximum          
Annual Performance Shares, Earned Percentage 200.00%     200.00%  
Relative Total Shareholder Return, Earned Percentage 200.00%     200.00%  
Annual Performance Shares          
Stock Compensation, Shares Awarded 23,889 34,176      
Annual Performance Shares | Maximum          
Stock Compensation, Shares Awarded 116,130        
Relative Total Shareholder Return          
Stock Compensation, Shares Awarded 60,754 9,703      
Relative Total Shareholder Return | Maximum          
Stock Compensation, Shares Awarded 140,914