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Note 12 - Income Tax
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Income Tax Disclosure [Text Block]

12.

Income Tax

 

Income tax (benefit) expense for the three months ended March 31, 2021 and 2020 was not significant. The effective tax rates for the three months ended March 31, 2021 and 2020, were 2.2% and (1.2)%, respectively.

 

The difference between the Company’s effective tax rates in 2021 and 2020 compared to the U.S. statutory tax rate of 21% is primarily due to changes in valuation allowances associated with the Company’s assessment of the likelihood of the recoverability of deferred tax assets. The Company currently has valuation allowances against substantially all of its net operating loss carryforwards and tax credit carryforwards.