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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
U.S. statutory rate |  | 21.00% | 21.00% | 35.00%
State taxes |  | 4.30% | 4.70% | 4.10%
State tax rate differential |  | (1.00%) |  |
Research and development credits |  | (0.80%) | (1.30%) | (1.40%)
State credits |  | (1.00%) | (1.00%) | (0.20%)
Share-based compensation | [1] | (0.60%) | (0.50%) | (1.40%)
Tax Act impact (2) | [2] |  | (0.20%) | (13.90%)
Other |  | (0.80%) | (0.20%) | (0.90%)
Effective tax rate |  | 21.10% | 22.50% | 21.30%
[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.
[2] | As a result of the Tax Act, we recognized a one-time, non-cash benefit of $28.4 million in the fourth quarter of 2017 primarily from the impact of the revaluation of our net deferred tax liabilities. This non-cash benefit resulted primarily from the Federal rate reduction from 35% to 21%.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit) + References No definition available. + Details
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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 changes in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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