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Note 14 - Income Tax - Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Computed "expected" income tax benefit, amount $ (1,531) $ (1,161)
Computed "expected" income tax benefit, percent 21.00% 21.00%
Permanent differences, net, amount $ 141 $ 241
Permanent differences, net, percent (1.90%) (4.40%)
Foreign tax rate differential, amount $ (14) $ 42
Foreign tax rate differential, percent 0.20% (0.80%)
State income taxes, net of federal income tax benefit, amount $ (77) $ (74)
State income taxes, net of federal income tax benefit, percent 1.10% 1.30%
Non-deductible stock compensation expense, amount $ 94 $ 205
Non-deductible stock compensation expense, percent (1.30%) (3.70%)
Tax credits, amount $ (192) $ (220)
Tax credits, percent 2.60% (4.00%)
Tax credits, amount $ 192 $ 220
Change in reserve for uncertain tax position, amount $ 259 $ (111)
Change in reserve for uncertain tax position, percent (3.60%) 2.00%
Impact of change to prior year tax accruals, amount $ 168 $ 314
Impact of change to prior year tax accruals, percent (2.30%) (5.70%)
Change in valuation allowance allocated to income tax, amount $ 2,130 $ (578)
Change in valuation allowance allocated to income tax, percent (29.20%) 10.50%
Other, amount $ (460) $ 87
Other, percent 6.30% (1.40%)
Total income tax expense (benefit), amount $ 518 $ (815)
Total income tax expense (benefit), percent (7.10%) 14.80%