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Note 12 - Commitments and Contingencies (Detail) (USD $)
0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 06, 2012
Apr. 26, 2011
Apr. 30, 2010
Oct. 31, 2012
Jul. 24, 2012
Feb. 29, 2012
Sep. 02, 2011
Jul. 31, 2011
May 13, 2011
Forecasts of Material and Finished Goods Requirements Rolling Period       6 months          
Recorded Unconditional Purchase Obligation               $ 380,000  
Letter Of Credit     77,000            
Loss Contingency, Damages Sought, Value 2,500,000 1,200,000              
Loss Contingency Amount Claimed for Recovery of Damages                 4,900,000
Previously Accrued Seeking Payments       $ 1,100,000 $ 1,400,000        
Number of Patents Relating to Power Technology             5    
Number of Comaro Patents           5 5    
Minimum [Member]
                 
Issue Purchase Orders to Suppliers with Delivery Dates       four          
Maximum [Member]
                 
Issue Purchase Orders to Suppliers with Delivery Dates       six