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Note 9 - Income Taxes - Reconciliation of Unrecognized Tax Benefit Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 2,060	$ 1,056	$ 0
Additions based on tax positions related to the current year	42	49	46
Additions for tax positions of prior years	287	955	1,010
Reductions for tax positions of prior years	0	0	0
Settlements	0	0	0
Balance	$ 2,389	$ 2,060	$ 1,056

X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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X

- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of increase in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

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