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Note 11 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income tax expense at federal statutory rate $ (351) $ 680
Income tax expense at federal statutory rate, percentage 21.00% 21.00%
Share-based compensation shortfall (windfall) $ (425) $ 7,080
Share-based compensation shortfall (windfall), percentage 25.40% 218.70%
Effect of state taxes, net of federal tax benefit $ (16) $ 64
Effect of state taxes, net of federal tax benefit, percentage 1.00% 2.00%
Non-deductible items $ 934 $ 585
Non-deductible items, percentage (55.80%) 18.10%
Return to provision adjustment $ 224 $ (4)
Return to provision adjustment, percentage (13.40%) (0.10%)
Foreign rate difference $ 3
Foreign rate difference, percentage
Other $ 71 $ 27
Other, percentage (4.20%) 0.80%
Change in valuation allowance $ (366) $ (8,386)
Change in valuation allowance, percentage 21.90% (259.00%)
Income tax expense $ 74 $ 46
Income tax expense, percentage (4.40%) 1.40%