Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Accumulated deficit	$ (11,059,500)	$ (12,811,000)
Net earnings	85,400	95,800
Cumulative effect of accounting change		96,100
Accumulated deficit	$ (10,974,100)	$ (12,619,100)