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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes Paid	$ 6,200	$ 9,100	$ 14,700
Tax Credit Carryforward, Amount	700	700
Deferred Tax Assets, Valuation Allowance, Total	567	567
Unrecognized Tax Benefits, Ending Balance	878	1,130	951	$ 797
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	700	900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 200	$ 300	$ 200

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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