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Note 15 - Income Tax Benefit - Effective Income Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amount computed using the statutory rate of 21% for 2023, 2022, and 2021 | 21.00% | 21.00% | 21.00%
Agri-biodiesel production credit | (3.20%) | (8.60%) | (7.40%)
Federal BTC benefit | (32.30%) | (76.20%) | (75.20%)
State BTC benefit | (4.40%) | (7.00%) | (8.90%)
Credit for increasing research activities | (0.50%) | (1.00%) | (0.70%)
Dividends received deduction | (0.10%) | (1.60%) | (1.60%)
State income taxes, net | 2.30% | 5.10% | 3.50%
State rate change and other deferred adjustments | (1.00%) | 3.60% | 5.00%
Valuation allowance for deferred tax assets | 18.20% | 53.80% | 0.00%
CARES Act | 0.00% | 0.00% | 0.00%
Other | 0.00% | 0.20% | (0.50%)
Income tax benefit | 0.00% | (10.70%) | (64.80%)

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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 changes in the income tax rates. + 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 federal BTC tax credit. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + 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 deduction for dividend. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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