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Note 15 - Income Taxes - Reconciliation of Statutory and Effective Tax Rates (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
U.S. statutory rate |  | 21.00% | 21.00% | 21.00%
State taxes |  | 4.30% | 4.30% | 4.30%
State tax rate differential |  | 0.00% | 0.00% | (1.00%)
Research and development credits |  | (1.00%) | (1.10%) | (0.80%)
State credits |  | (1.10%) | (1.50%) | (1.00%)
Share-based compensation | [1] | (3.80%) | (1.00%) | (0.60%)
Nondeductible U.S. compensation |  | 1.50% | 0.00% | 0.00%
Foreign tax deduction |  | (1.50%) | 0.00% | 0.00%
Foreign deferred tax rate change |  | 1.20% | 0.00% | 0.00%
Other |  | (1.10%) | 0.50% | (0.80%)
Effective tax rate |  | 19.50% | 22.20% | 21.10%
[1] | With the adoption of ASU 2016-09 in 2017, excess tax benefits from equity awards are reflected within the provision for income taxes rather than within the consolidated balance sheet.

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state tax credit. + References No definition available. + Details
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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 + Details
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