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Note 11 - Income Tax	3 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Income Tax Disclosure [Text Block]	11. Income Tax Income tax benefit was $0.1 million for the three months ended March 31, 2022 and was less than $0.1 million for the three months ended March 31, 2021. The effective tax rates for the three months ended March 31, 2022 and 2021, were 2.0% and 2.2%, respectively. The difference between the Company’s effective tax rates in 2022 and 2021 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.

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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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