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Property, Plant, and Equipment, at Cost (Details) (USD $)
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Property, plant and equipment      
Property, plant and equipment $ 103,617,000 $ 91,042,000  
Less accumulated depreciation and amortization (37,438,000) (29,421,000)  
Property, plant and equipment excluding land and land improvements 66,179,000 61,621,000  
Land and land improvements 1,029,000 1,029,000  
Property, plant and equipment, Net 67,208,000 62,650,000  
Depreciation expense 8,000,000 8,700,000 3,600,000
Trade shows 62,000 487,000  
Building and building improvements [Member]
     
Property, plant and equipment      
Property, plant and equipment 33,126,000 30,150,000  
Estimated useful lives 39 years    
Machinery and equipment [Member]
     
Property, plant and equipment      
Property, plant and equipment 32,091,000 31,129,000  
Machinery and equipment [Member] | Minimum [Member]
     
Property, plant and equipment      
Estimated useful lives 3 years    
Machinery and equipment [Member] | Maximum [Member]
     
Property, plant and equipment      
Estimated useful lives 8 years    
Computer software and equipment [Member]
     
Property, plant and equipment      
Property, plant and equipment 25,836,000 16,390,000  
Computer software and equipment [Member] | Minimum [Member]
     
Property, plant and equipment      
Estimated useful lives 3 years    
Computer software and equipment [Member] | Maximum [Member]
     
Property, plant and equipment      
Estimated useful lives 10 years    
Construction in progress [Member]
     
Property, plant and equipment      
Property, plant and equipment $ 12,564,000 $ 13,373,000