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Note 16 - Income Taxes - Reconciliation Between U.S. Federal Statutory Rate and Effective Rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statutory federal income tax rate | 21.00% | 21.00% | 35.00%
State tax expense, net of federal benefit | 5.50% | 5.50% | 4.80%
Impact of rate change on deferred taxes | 0.00% | 0.00% | (4.90%)
Permanent items, including nondeductible expenses | (0.10%) | (1.40%) | 0.10%
State investment tax credit | (0.10%) | (0.20%) | (0.70%)
Federal, state and foreign research and development credits | (1.40%) | (3.40%) | (1.40%)
Foreign rate differential | (0.20%) | (0.40%) | 0.50%
Domestic production deduction | 0.00% | 0.00% | (2.80%)
Stock compensation | 0.60% | (4.80%) | (0.20%)
Non-deductible Section 162(m) compensation limitation | 0.30% | 4.30% | 0.70%
Foreign derived intangible income deduction | (0.90%) | (1.30%) | 0.00%
Effective income tax rate | 24.70% | 19.30% | 31.10%

X
- 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 foreign derived intangible income deduction. + 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 section 162(m) limitation. + 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 permanent items including nondeductible expenses. + 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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