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Note 14 - Income Taxes - Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
U.S. federal statutory rate in effect | 21.00% | 21.00% | 35.00%
State and local taxes, net of federal benefit | 3.70% | 4.60% | 3.60%
Sec. 199 manufacturing deduction |  |  | (3.80%)
Meals and entertainment | 5.80% | 0.60% | 1.80%
Tax credits | (4.20%) | (0.60%) | (1.30%)
Change in valuation allowance |  |  | 0.60%
Change in U.S. federal statutory rate |  |  | (37.70%)
Change in tax affect of SERP |  |  | (11.40%)
All other, net | 0.80% | 1.10% | (2.80%)
Effective income tax rate | 27.10% | 26.70% | (16.00%)

X
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