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Deferred Compensation Plan - Narrative (Details) - USD ($)
9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Deferred Compensation Arrangements [Abstract]      
Deferred Compensation Liability, Current $ 362,000    
Deferred compensation 379,000   $ 684,000
Purchases of available-for-sale securities 0 $ 37,000  
Proceeds from Sale of Available-for-sale Securities 0 0  
Other-than-temporary impairments 0 $ 0  
Transfers of assets between Level 1 and Level 2 $ 0    
Maximum      
Deferred Compensation Arrangements [Abstract]      
Deferred compensation plan, maximum percentage of employees' base salary 100.00%