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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense Reconciliation |  |  |
Tax at U.S. statutory rates | $ 3,459,464 | $ 502,690 | $ (3,125,382)
State income taxes, net of federal tax benefit | 268,924 | 65,546 | (48,842)
State valuation allowance | (314,505) | 8,498 | 95,961
Life insurance cash surrender value | 0 | 0 | 503,700
Manufacturing exemption | 0 | (116,980) | 0
Stock option compensation | (39,401) | 226 | 45,929
Rate change effects | 0 | (380,961) | 0
Other, net | 1,728 | 58,120 | 330,634
Total | $ 3,376,210 | $ 137,139 | $ (2,198,000)
Effective Tax Rate Reconciliation |  |  |
Tax at U.S. statutory rates | 21.00% | 34.00% | 34.00%
State income taxes, net of federal tax benefit | 1.60% | 4.40% | 0.50%
State valuation allowance | (1.90%) | 0.60% | (1.00%)
Life insurance cash surrender value | 0.00% | 0.00% | (5.50%)
Manufacturing exemption | 0.00% | (7.90%) | 0.00%
Stock option compensation | (0.20%) | 0.00% | (0.50%)
Rate change effects | 0.00% | (25.80%) | 0.00%
Other, net | 0.00% | 4.00% | (3.60%)
Total | 20.50% | 9.30% | 23.90%

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