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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax assets:    
Net operating loss carryforwards $ 482 $ 808
R&D tax credit carryforwards 1,723 1,672
Impairment charges 0 723
Compensation costs 10 149
Vacation accrual 174 141
Intangible assets 27 0
Capitalized research and development 356 0
Other items 263 114
Deferred income tax assets 3,035 3,607
Less: valuation allowance (2,957) (2,990)
Deferred income tax assets, net of valuation allowance 78 617
Deferred incomes tax liability:    
Property, plant and equipment (11) (617)
Prepaid expenses (67) 0
Deferred income tax asset, net $ 0 $ 0