Revenues (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
|
| Revenue from Contract with Customer [Abstract] | |||||
| Long-term receivable | $ 1,521,700 | $ 1,521,700 | |||
| Accrued expenses, non-current | 106,500 | 106,500 | |||
| Accumulated deficit | (12,811,000) | ||||
| Net earnings | 1,447,500 | $ 70,400 | 1,543,300 | $ 114,400 | |
| Cumulative effect of accounting change | 96,100 | ||||
| Accumulated deficit | $ (11,171,600) | $ (11,171,600) | |||