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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 | May 31, 2014 | May 31, 2013 | May 31, 2012
Reasons for consolidated income tax provision |  |  |  |
Income tax (benefit) provision | $ 176 | $ 3,292 | $ (31) | $ (188)
Effect of Graduated tax rates |  | 64 | (6) | (53)
State income taxes, net of Federal tax benefit |  | (122) | (88) | (158)
State income tax credits, net of Federal tax benefit |  | 0 | 23 | 69
Impact of Non US operations |  | 27 | 228 | (46)
Tax-exempt interest |  | 0 | 2 | 4
Research and development tax credit |  | 236 | 142 | 115
Domestic Production Activities deduction |  | 0 | 0 | 71
Nondeductible acquisition costs |  | 0 | (110) | (1,144)
Nondeductible interest on contingent payments |  | (540) | (130) | 0
Nontaxable gain on revaluation of contingent consideration liability |  | 1,698 | 0 | 0
Tax law change |  | (1,173) | 0 | 0
Effect of elimination of ASC 718 APIC pool |  | (440) | 0 | 0
Nondeductible stock-based compensation |  | (176) | (108) | (125)
Other nondeductible expenses |  | (384) | (336) | (336)
Overaccrual (underaccrual) of prior year Federal and state taxes |  | (249) | 10 | 138
Fully reserved capital losses |  | 0 | 179 | (208)
Other |  | 0 | 0 | 12
Income tax (benefit) provision at statutory tax rate of 35% |  | $ 2,233 | $ (225) | $ (1,849)

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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to the impact of non US operations. + References No definition available. + Details
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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local tax credits. + References No definition available. + Details
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