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Benefit Plans and Collective Bargaining Agreements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total employer contributions to plans under collective-bargaining arrangements | $ 32,034 | $ 29,042 | $ 22,256
401(k) Employee Stock Ownership Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee maximum contribution percentage | 100.00% |  |
Employee maximum contribution amount | $ 18,500 |  |
Minimum age to qualify under Economic Growth and Tax Relief Reconciliation Act | 50 years |  |
Employee additional contribution eligible under Economic Growth and Tax Relief Reconciliation Act | $ 6,000 |  |
Employee maximum contribution eligible under Economic Growth and Tax Relief Reconciliation Act | $ 24,500 |  |
Employer maximum contribution percentage match | 100.00% |  |
Matching percentage by employer of employees' gross pay | 4.00% |  |
Matching contributions made by employer | $ 694,795 | 608,473 | 516,991
Employer discretionary contribution | $ 0 | 0 | 0
401(k) and Profit Sharing Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee maximum contribution percentage | 60.00% |  |
Employee maximum contribution amount | $ 18,500 |  |
Minimum age to qualify under Economic Growth and Tax Relief Reconciliation Act | 50 years |  |
Employee additional contribution eligible under Economic Growth and Tax Relief Reconciliation Act | $ 6,000 |  |
Employee maximum contribution eligible under Economic Growth and Tax Relief Reconciliation Act | $ 24,500 |  |
Employer contribution as a percentage of participant's eligible compensation | 3.00% |  |
Matching contributions made by employer | $ 215,778 | 174,229 | 136,763
Employer discretionary contribution | $ 0 | 0 | $ 0
Maximum | Other Pension, Postretirement and Supplemental Plans |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Funding percentage under defined benefit plans | 80.00% |  |
Employer contribution percentage of each participant's eligible compensation | 4.00% |  |
Employer's contribution percentage of total contributions | 5.00% |  |
Employer contributions to defined benefit plans | $ 129,403 | $ 69,245 |

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