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Inventories (Details) (USD $)
Jun. 30, 2012
Jun. 30, 2011
Inventories, Gross $ 2,442,934 $ 2,361,875
Reserve (71,490) (70,971)
Inventories, net 2,371,444 2,290,904
Equipment
   
Inventories, Gross 1,473,053 1,403,654
Parts
   
Inventories, Gross $ 969,881 $ 958,221