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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2014
Jan. 31, 2013
Deferred tax assets    
Accrued vacation and sick leave $ 913 $ 830
Retirement plans 8,960 10,343
Insurance reserves 956 1,193
Warranty 481 451
Net operating loss carryforwards 12,494 12,072
Intangibles 207 272
Inventory 1,590 723
Other 907 1,250
Total deferred tax assets 26,508 27,134
Deferred tax liabilities    
Tax in excess of book depreciation (1,407) (1,540)
Other (76) (81)
Total deferred tax liabilities (1,483) (1,621)
Valuation allowance (24,210) (24,601)
Net deferred tax asset 815 912
Deferred Tax Assets, Net, Current 203 0
Current deferred tax liabilities 0 (572)
Long-term deferred tax assets $ 611 $ 1,484