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Note 6 - Acquisitions (Details) - Allocation of The Purchase Price For Acquisitions (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Assets acquired:    
Inventories $ 1,294  
Property and equipment 18,384  
Total assets 19,678  
Liabilities assumed:    
Total liabilities 101  
Net tangible assets acquired, net of cash 19,577  
Goodwill and other intangible assets 4,965  
Total consideration paid, net of cash acquired 24,542 3,307
Accrued Liabilities [Member]
    
Liabilities assumed:    
Accrued expenses $ 101