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Income Taxes - Components of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Current deferred tax assets    
Accrued marketing programs $ 144 $ 169
Accrued warranty expense 1,800 1,464
Accrued workers' compensation 886 650
Accrued vacation 325 329
Other 522 223
Gross current deferred tax assets 3,677 2,835
Noncurrent deferred tax assets    
Liability for certain post-retirement benefits 2,017 2,061
Accrued warranty expense 958 792
Federal net operating loss carryforward 33,120 30,488
Federal tax credit carryforward 1,501 1,345
State net operating loss carryforward 8,133 7,860
Depreciation 668 854
Other (167) (32)
Gross noncurrent deferred tax assets 46,230 43,368
Total gross deferred tax assets 49,907 46,203
Valuation allowance (49,907) (46,203)
Net deferred tax assets $ 0 $ 0