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Note 3 - Acquisitions (Details) - Allocation of the Purchase Price for Acquisitions (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Note 3 - Acquisitions (Details) - Allocation of the Purchase Price for Acquisitions [Line Items]      
Goodwill $ 120,406 $ 114,791  
Total consideration paid 31,584 29,527 39,444
In Fiscal Year 2014 [Member]
      
Note 3 - Acquisitions (Details) - Allocation of the Purchase Price for Acquisitions [Line Items]      
Inventories 1,622    
Property and equipment 24,469    
Total assets 26,091    
Accrued expenses 122    
Total liabilities 122    
Net tangible assets acquired 25,969    
Goodwill 5,615    
Total consideration paid $ 31,584