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Note 12 - Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Inventory (excluding LIFO reserve) $ 2,531 $ 2,986
Net operating loss and tax credit carryforwards 3,224 2,926
Allowance for doubtful accounts 533 500
Accrued expenses 7,228 7,311
Other 169 143
13,685 13,866
Valuation reserve (2,017) (1,030)
Total deferred tax assets 11,668 12,836
Deferred tax liabilities:    
LIFO reserve (5,874) (6,018)
Property and equipment (19,846) (22,535)
Intangibles (9,067) (9,396)
Total deferred tax liabilities (34,787) (37,949)
Deferred tax liabilities, net $ (23,119) $ (25,113)