Note 12 - Income Taxes	3 Months Ended
Mar. 31, 2021
Notes to Financial Statements
Income Tax Disclosure [Text Block]	(12) Income Taxes The determination of income tax expense in the accompanying unaudited condensed consolidated statements of income is based upon the estimated effective tax rate for the year, adjusted for the impact of any discrete items which are accounted for in the period in which they occur. The Company recorded income tax expense of approximately 21.4% and 17.8% of income before income tax expense for the three-month periods ended March 31, 2021 and 2020, respectively. The increase in the effective tax rate for the current period as compared to the prior period was largely due to a lower anticipated effective tax rate in 2020 due to credits available for increased research activities.

- Definition

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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