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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Short-Term Receivables      
Movement in Valuation Allowances [Roll Forward]      
Valuation Allowances, Balance at Beginning of Year $ 352 $ 750 $ 381
Valuation Allowances, Additions to Expense (80) (350) 463
Valuation Allowances, Adjustments to Other Accounts 1 45 (120)
Valuation Allowances, Write-offs and Recoveries (37) (93) 26
Valuation Allowances, Balance at End of Year 236 352 750
Deferred Tax Asset      
Movement in Valuation Allowances [Roll Forward]      
Valuation Allowances, Balance at Beginning of Year 92 1,613 1,224
Valuation Allowances, Additions to Expense 0 0 409
Valuation Allowances, Adjustments to Other Accounts (92) 0 0
Valuation Allowances, Write-offs and Recoveries 0 (1,521) (20)
Valuation Allowances, Balance at End of Year $ 0 $ 92 $ 1,613