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Note 5 - Income Taxes - Tax Reserves (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Taxes	$ 13	$ 8	$ 101
Interest	6
Penalty	1
Total Tax Liability	20
State and Local Jurisdiction [Member]
Taxes	13
Interest	6
Penalty	1
Total Tax Liability	20
Domestic Tax Authority [Member]
Taxes
Interest
Penalty
Total Tax Liability
Foreign Tax Authority [Member]
Taxes
Interest
Penalty
Total Tax Liability

X

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.

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- Definition

Amount of unrecognized tax benefits.

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Amount of interest expense accrued for an underpayment of income taxes.

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