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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense Reconciliation |  |  |
Tax at U.S. statutory rates | $ (790) | $ 3,459 | $ 503
State income taxes, net of federal tax benefit | 165 | 269 | 66
State valuation allowance | (60) | (315) | 8
Manufacturing exemption | 0 | 0 | (117)
Stock option compensation | (155) | (39) | 0
Executive compensation limitation | 57 | 0 | 0
Other nondeductible expenses | 64 | 0 | 0
Rate change effects | 0 | 0 | (381)
Other, net | (8) | 2 | 58
Total | $ (727) | $ 3,376 | $ 137
Effective Tax Rate Reconciliation |  |  |
Tax at U.S. statutory rates | 21.00% | 21.00% | 34.00%
State income taxes, net of federal tax benefit | (4.40%) | 1.60% | 4.40%
State valuation allowance | 1.60% | (1.90%) | 0.60%
Manufacturing exemption | 0.00% | 0.00% | (7.90%)
Stock option compensation | 4.10% | (0.20%) | 0.00%
Executive compensation limitation | (1.50%) | 0.00% | 0.00%
Other nondeductible expenses | (1.70%) | 0.00% | 0.00%
Rate change effects | 0.00% | 0.00% | (25.80%)
Other, net | 0.20% | 0.00% | 4.00%
Total | 19.30% | 20.50% | 9.30%

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