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Warranty (Details) (USD $)
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Accrual for warranty costs    
Balances, beginning of period $ 526,000 $ 688,000
Accruals during the period 149,000 137,000
Changes in estimates of prior period accruals 8,000 91,000
Warranty expenditures (98,000) (238,000)
Balances, end of period $ 585,000 $ 678,000