Note 2 - Business Combinations (Tables)
12 Months Ended
May. 31, 2015
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Cash on hand

  $ 2,558  

Accounts receivable

    7,697  

Inventories

    16,800  

Property and equipment

    13,432  

Intangible assets

    33,240  

Goodwill

    36,889  

Current liabilities

    (4,669 )

Deferred tax assets and liabilities - net

    (15,197 )

Other assets and liabilities - net

    (146 )

Total consideration paid

    90,604  

Less: Contingent consideration liability

    (4,400 )

Total cash purchase price

  $ 86,204  
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
            Useful Life  

Intangible Asset

  Fair Value     in Years  
                 

Customer relationships

  $ 16,000       20  

Existing technology

    13,250       10  

Trade name

    2,250       22  

Below market leasehold interests

    340       2 to 12  

In-process research and development

    1,400     n/a  
    $ 33,240          
Sources and Uses of funds from Acquisition [Table Text Block]
Sources:        

Proceeds from Term Loan

  $ 50,000  

Proceeds from equity contributions

    42,500  
    $ 92,500  

Uses:

       

Equity purchase price

  $ 86,204  

Transaction costs

    4,161  

Additional working capital

    2,135  
    $ 92,500