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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

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