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Pension and Profit Sharing - Pension Plan Assets by Fair Value Hiearchy (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension plan assets | $ 1,249,825 | $ 1,294,727 | $ 1,417,572
Money Market Fund |  |  |
Pension plan assets | 10,774 | 39,224 |
Equity Common and Collected Funds |  |  |
Pension plan assets | 836,594 | 837,260 |
Fixed Income Common and Collected Funds |  |  |
Pension plan assets | 402,431 | 418,243 |
Level 1 |  |  |
Pension plan assets | 225,881 | 255,555 |
Level 1 | Money Market Fund |  |  |
Pension plan assets |  | 19,327 |
Level 1 | Equity Common and Collected Funds |  |  |
Pension plan assets | 125,451 | 131,737 |
Level 1 | Fixed Income Common and Collected Funds |  |  |
Pension plan assets | 100,430 | 104,491 |
Level 2 |  |  |
Pension plan assets | 1,023,918 | 1,039,172 |
Level 2 | Money Market Fund |  |  |
Pension plan assets | 10,774 | 19,897 |
Level 2 | Equity Common and Collected Funds |  |  |
Pension plan assets | 711,143 | 705,523 |
Level 2 | Fixed Income Common and Collected Funds |  |  |
Pension plan assets | 302,001 | 313,752 |
Level 3 |  |  |
Pension plan assets | $ 0 | $ 0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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