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Warranty Accrual (Details) (USD $)
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Accrual for warranty costs    
Balance at beginning of year $ 688,000 $ 676,000
Accruals during the year 486,000 627,000
Changes in estimates of prior period accruals 290,000 64,000
Warranty expenditures (938,000) (679,000)
Balance at end of year $ 526,000 $ 688,000