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Comprehensive Income - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated other comprehensive income, beginning balance $ (2,336,201) $ (2,530,790)
Change in net prior service credit and actuarial losses, net of tax 87,461 284,145
Translation adjustment 614,741 (89,556)
Accumulated other comprehensive income, ending balance (1,633,999) (2,336,201)
Foreign Currency Translation Adjustment    
Accumulated other comprehensive income, beginning balance (1,672,188) (1,582,632)
Translation adjustment 614,741 (89,556)
Accumulated other comprehensive income, ending balance (1,057,447) (1,672,188)
Net Prior Service Credit and Actuarial Losses    
Accumulated other comprehensive income, beginning balance (664,012) (948,157)
Change in net prior service credit and actuarial losses, net of tax 87,461 284,145
Accumulated other comprehensive income, ending balance $ (576,551) $ (664,012)