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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Financial Assets    
Marketable securities $ 1,317  
Recurring    
Financial Assets    
Short-term investments 2,100  
Marketable securities 1,317 $ 1,215
Total Financial Assets 3,417 1,215
Financial Liabilities    
Contingent liability for acquisition earn outs 3,261 12,761
Total Financial Liabilities 3,261 12,761
Recurring | Level 1    
Financial Assets    
Short-term investments 2,100  
Marketable securities 0 0
Total Financial Assets 2,100 0
Financial Liabilities    
Contingent liability for acquisition earn outs 0 0
Total Financial Liabilities 0 0
Recurring | Level 2    
Financial Assets    
Short-term investments 0  
Marketable securities 0 0
Total Financial Assets 0 0
Financial Liabilities    
Contingent liability for acquisition earn outs 0 0
Total Financial Liabilities 0 0
Recurring | Level 3    
Financial Assets    
Short-term investments 0  
Marketable securities 1,317 1,215
Total Financial Assets 1,317 1,215
Financial Liabilities    
Contingent liability for acquisition earn outs 3,261 12,761
Total Financial Liabilities $ 3,261 $ 12,761