Employee Benefits and Retirement Plans - Pension Asset Allocation and Fair Value Measurement (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity	$ 3,482,765	$ 4,302,437
Equity, percentage	36.00%	40.00%
Fixed income	$ 1,096,033	$ 1,351,048
Fixed income, percentage	11.00%	13.00%
Total	$ 4,578,798	$ 5,653,485
Total, percentage	47.00%	53.00%
Certificates of deposit	$ 4,521,110	$ 4,283,144
Certificates of deposits, percentage	47.00%	40.00%
Cash and cash equivalent	$ 579,846	$ 736,182
Cash and cash equivalents, percentage	6.00%	7.00%
Total	$ 5,100,956	$ 5,019,326
Total, percentage	53.00%	47.00%
Fair value of plan assets	$ 9,679,754	$ 10,672,811	$ 10,574,145	$ 11,420,270
Fair value of plan assets, percentage	100.00%	100.00%
Level 1 [Member]
Equity	$ 3,482,765	$ 4,302,437
Fixed income	1,096,033	1,351,048
Total	4,578,798	5,653,485
Certificates of deposit	4,521,110	4,283,144
Cash and cash equivalent	579,846	736,182
Total	5,100,956	5,019,326
Fair value of plan assets	$ 9,679,754	$ 10,672,811