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Note 20 - Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Compensation and benefit accruals $ 450 $ 585
Inventory valuation 759 739
Federal and state net operating loss carryforwards 33,567 32,646
Deferred revenue 90 296
Accounts receivable allowance 11 34
Depreciation 39 0
Defined benefit pension plan 573 802
Foreign deferred revenue and other provisions 4,434 4,942
Other 874 917
Total 40,797 40,961
Domestic valuation allowance (36,363) (35,387)
Foreign valuation allowance (4,137) (4,942)
Total deferred tax assets 297 632
Deferred tax liabilities:    
Depreciation 0 (632)
Total deferred tax liabilities 0 (632)
Net deferred tax asset $ 297 $ 0