XML 21 R55.htm IDEA: XBRL DOCUMENT v3.2.0.727
Long-Term Investments (Details) - Auction Rate Securities [Member] - USD ($)
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]      
Auction-rate securities, net of unrealized losses $ 2,633,000 $ 2,647,000  
Auction-rate securities, unrealized gains (losses), period impact (14,000) 10,000  
Auction-rate securities, unrealized holding gains (losses), gross 117,000 103,000  
Auction-rate securities, unrealized holding gains (losses), net of taxes (70,000) (62,000)  
Auction rate securities, redeemed at par $ 0 $ 0 $ 300,000
Discounted Cash Flow Approach Valuation Technique [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value inputs, discount rate 1.93%    
Fair value inputs, time period until redemption 3 years    
Fair value inputs, estimated rate of return 0.47%    
Fair value investment, increase or decrease in rate of return 1.00%    
Fair value investment, increase or decrease in term 1 year    
Discounted Cash Flow Approach Valuation Technique [Member] | Minimum [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value, change in investment portfolio 1.00%    
Discounted Cash Flow Approach Valuation Technique [Member] | Maximum [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Fair value, change in investment portfolio 3.00%