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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Jan. 31, 2017
Oct. 31, 2016
Deferred tax assets      
Accrued vacation and sick leave $ 1,015 $ 1,211  
Retirement plans 3,756 6,900  
Insurance reserves 451 633  
Warranty 242 383  
Net operating loss carryforwards 4,722 7,627  
Intangibles 0 0  
Inventory 1,085 1,418  
Other 624 1,005  
Total deferred tax assets 11,895 19,177  
Deferred tax liabilities      
Tax in excess of book depreciation (811) (1,556)  
Other (66) (98)  
Total deferred tax liabilities (877) (1,654)  
Valuation allowance (925) (515) $ (17,962)
Net long term deferred tax asset $ 10,093 $ 17,008