Pension and Profit Sharing - Pension Plan Assets by Fair Value Hiearchy (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension plan assets	$ 1,013,081	$ 1,249,825	$ 1,294,727
Money Market Fund
Pension plan assets	17,324	10,774
Equity Common and Collected Funds
Pension plan assets	663,957	836,594
Fixed Income Common and Collected Funds
Pension plan assets	332,520	402,431
Level 1
Pension plan assets	182,831	225,881
Level 1 | Money Market Fund
Pension plan assets	4
Level 1 | Equity Common and Collected Funds
Pension plan assets	99,616	125,451
Level 1 | Fixed Income Common and Collected Funds
Pension plan assets	83,211	100,430
Level 2
Pension plan assets	830,970	1,023,918
Level 2 | Money Market Fund
Pension plan assets	17,320	10,774
Level 2 | Equity Common and Collected Funds
Pension plan assets	564,341	711,143
Level 2 | Fixed Income Common and Collected Funds
Pension plan assets	249,309	302,001
Level 3
Pension plan assets	$ 0	$ 0