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Note 12 - Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Inventory (excluding LIFO reserve) $ 1,690 $ 2,531
Net operating loss and tax credit carryforwards 3,520 3,224
Allowance for doubtful accounts 419 533
Accrued expenses 5,684 7,228
Other 143 169
Deferred tax assets before valuation allowance 11,456 13,685
Valuation allowance (2,379) (2,017)
Total deferred tax assets 9,077 11,668
Deferred tax liabilities:    
LIFO reserve (3,958) (5,874)
Property and equipment (11,363) (19,846)
Intangibles (5,901) (9,067)
Total deferred tax liabilities (21,222) (34,787)
Deferred tax liabilities, net $ (12,145) $ (23,119)