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Note 8 - Income Taxes - Reconciliation of Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Tax at federal statutory rate | 21.00% | 21.00% | 35.00%
Federal statutory rate change on deferred tax liability |  |  | (35.20%)
State income taxes, net of federal benefit | (0.20%) | 5.90% | 2.70%
Compensation-based credits | (1.20%) | (1.90%) | (1.00%)
Nondeductible expenses | 0.40% | 0.70% | 0.50%
Tax exempt interest | (0.20%) | (0.20%) | (0.30%)
Company provided benefits | 1.60% | 0.10% | 0.50%
Other, net | 0.40% | 0.40% | (0.40%)
Effective tax rate | 21.80% | 26.00% | 1.80%

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