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Benefit Plans and Collective Bargaining Agreements Defined Contribution Plans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
401(k) Employee Stock Ownership Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Cost Recognized | $ 608,473 | $ 516,991 | $ 541,260
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 100.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 | $ 0 | $ 0
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act | $ 24,000 |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 4.00% | 4.00% | 4.00%
Defined Contribution Plan, Additional Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act | $ 6,000 |  |
Defined Contribution Plan, Additional Annual Contribution Per Employee, Minimum Age Under Economic Growth and Tax Relief Reconciliation Act | 50 years |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | $ 18,000 |  |
401(k) and Profit Sharing Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Cost Recognized | $ 174,229 | $ 136,763 | $ 147,005
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 60.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 | $ 0 | $ 0
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act | 24,000 |  |
Defined Contribution Plan, Additional Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act | $ 6,000 |  |
Defined Contribution Plan, Additional Annual Contribution Per Employee, Minimum Age Under Economic Growth and Tax Relief Reconciliation Act | 50 years |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | $ 18,000 |  |
Maximum [Member] | Other Pension Plan, Postretirement or Supplemental Plans [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Funded Percentage | 80.00% |  |
Defined Benefit Plan, Employer Contribution Percent of Eligible Compensation | 3.75% |  |
Defined Benefit Plan, Employer Contribution as Percent of Total Contributions | 5.00% |  |
Defined Benefit Plan, Contributions by Employer | $ 69,245 |  |

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