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Income Taxes - Components of Deferred Federal Income Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Accrued liabilities $ 136 $ 15
Deferred compensation 520 1,113
Allowance for doubtful accounts 71 101
Inventory 73 83
Net operating loss 2,783 6,528
Property and equipment 71 143
Foreign tax credit carry forward   3,297
Deferred tax assets 3,654 11,280
Deferred tax liabilities:    
Valuation allowance (3,654) (11,280)
Equity in foreign investments   (2,824)
Deferred tax liabilities $ (3,654) (14,104)
Net deferred tax assets (liabilities)   $ (2,824)