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Note 20 - Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Compensation and benefit accruals $ 585 $ 1,517
Inventory valuation 739 1,481
Federal and state net operating loss carryforwards 32,646 49,298
Deferred revenue 296 63
Accounts receivable allowance 34 153
Defined benefit pension plan 802 1,627
Foreign deferred revenue and other provisions 4,942 3,269
AMT credits 0 185
Other 917 777
Total 40,961 58,370
Domestic valuation allowance (35,387) (52,900)
Foreign valuation allowance (4,942) (3,269)
Total deferred tax assets 632 2,201
Deferred tax liabilities:    
Foreign subsidiaries – unrepatriated earnings 0 (543)
Depreciation (632) (1,658)
Total deferred tax liabilities (632) (2,201)
Net deferred tax asset $ 0 $ 0