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Note 14. Stock Compensation - Stock Compensation Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Stock based Compensation Expense $ 1.1     $ 0.8 $ 4.7 $ 3.3
Tax benefit for stock compensation arrangements $ 0.3     $ 0.3 $ 1.2 1.7
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 234 23,889 34,176      
Annual Performance Shares | Maximum            
Stock Compensation, Shares Awarded 116,598          
Relative Total Shareholder Return            
Stock Compensation, Shares Awarded   60,754 9,703      
Relative Total Shareholder Return | Maximum            
Stock Compensation, Shares Awarded 140,914