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Income Taxes - Components of Net Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Current deferred tax assets    
Accrued marketing programs $ 169 $ 55
Accrued warranty expense 1,464 1,466
Accrued workers' compensation 650 638
Accrued vacation 329 319
Other 223 143
Gross current deferred tax assets 2,835 2,621
Noncurrent deferred tax assets    
Liability for certain post-retirement benefits 2,061 2,252
Accrued warranty expense 792 876
Federal net operating loss carryforward 30,488 26,616
Federal tax credit carryforward 1,345 1,205
State net operating loss carryforward 7,860 7,380
Depreciation 854 735
Other (32) (43)
Gross noncurrent deferred tax assets 43,368 39,021
Total gross deferred tax assets 46,203 41,642
Valuation allowance (46,203) (41,642)
Net deferred tax assets $ 0 $ 0