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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 31, 2016
USD ($)
$ / shares
shares
Schedule summarizes stock option activity  
Shares Outstanding at beginning of year | shares 2,299,313
Shares Granted | shares 564,380
Shares Exercised | shares (145,260)
Shares Forfeited | shares (304,563)
Shares Expired | shares (132,252)
Shares Outstanding at end of year | shares 2,281,618
Shares Options exercisable at year end | shares 1,313,698
Shares Option expected to vest in future periods | shares 854,189
Weighted Average exercise price, Outstanding at beginning of year | $ / shares $ 14.86
Weighted Average exercise price Granted | $ / shares 14.22
Weighted Average exercise price Exercised | $ / shares 13.73
Weighted Average exercise price Forfeited | $ / shares 13.85
Weighted Average exercise price Expired | $ / shares 22.75
Weighted Average exercise price, Outstanding at end of year | $ / shares 14.45
Weighted Average exercise price, Options exercisable at year end | $ / shares 14.25
Weighted Average exercise price, Options expected to vest in future periods | $ / shares $ 14.72
Weighted Average remaining contractual life 3 years 9 months 14 days
Weighted Average remaining contractual life, Option exercisable at year end 2 years 4 months 2 days
Weighted Average remaining contractual life, Option expected to vest in future periods 5 years 9 months 3 days
Aggregate intrinsic value, Outstanding at end of year | $ $ 164
Aggregate intrinsic value, Options exercisable at year end | $ 130
Aggregate intrinsic value, Option expected to vest in future periods | $ $ 30