| Schedule of Segment Reporting Information | 
The following table presents information by reportable segment for the three and nine months ended September 30, 2019 and 2018: 
 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   |  Products and Services |   | Energy Production |   | Corporate, other and elimination (1) |   | Total |  
| Nine months ended September 30, 2019 |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |  
| Revenue - external customers |   | $ | 22,263,794 | 
 |   | $ | 2,450,710 | 
 |   | $ | — | 
 |   | $ | 24,714,504 | 
 |  
| Intersegment revenue |   | 470,169 | 
 |   | — | 
 |   | (470,169 | ) |   | — | 
 |  
|    Total revenue |   | $ | 22,733,963 | 
 |   | $ | 2,450,710 | 
 |   | $ | (470,169 | ) |   | $ | 24,714,504 | 
 |  
| Gross profit |   | $ | 8,223,565 | 
 |   | $ | 992,350 | 
 |   | $ | — | 
 |   | $ | 9,215,915 | 
 |  
| Identifiable assets |   | $ | 25,166,483 | 
 |   | $ | 3,375,306 | 
 |   | $ | 11,412,533 | 
 |   | $ | 39,954,322 | 
 |  
|   |   |   |   |   |   |   |   |   |  
| Nine months ended September 30, 2018 |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |  
| Revenue - external customers |   | $ | 21,816,696 | 
 |   | $ | 4,750,580 | 
 |   | $ | — | 
 |   | $ | 26,567,276 | 
 |  
| Intersegment revenue |   | 863,077 | 
 |   | — | 
 |   | (863,077 | ) |   | — | 
 |  
|    Total revenue |   | $ | 22,679,773 | 
 |   | $ | 4,750,580 | 
 |   | $ | (863,077 | ) |   | $ | 26,567,276 | 
 |  
| Gross profit  |   | $ | 7,958,320 | 
 |   | $ | 1,922,175 | 
 |   | $ | — | 
 |   | $ | 9,880,495 | 
 |  
| Identifiable assets |   | $ | 21,311,668 | 
 |   | $ | 12,870,771 | 
 |   | $ | 16,579,095 | 
 |   | $ | 50,761,534 | 
 |  
|   |   |   |   |   |   |   |   |   |  
| Three months ended September 30, 2019 |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |  
| Revenue - external customers |   | $ | 8,038,875 | 
 |   | $ | 631,602 | 
 |   | $ | — | 
 |   | $ | 8,670,477 | 
 |  
| Intersegment revenue |   | 113,008 | 
 |   | — | 
 |   | (113,008 | ) |   | — | 
 |  
|    Total revenue |   | $ | 8,151,883 | 
 |   | $ | 631,602 | 
 |   | $ | (113,008 | ) |   | $ | 8,670,477 | 
 |  
| Gross profit |   | $ | 2,493,568 | 
 |   | $ | 337,673 | 
 |   | $ | — | 
 |   | $ | 2,831,241 | 
 |  
| Identifiable assets |   | $ | 25,166,483 | 
 |   | $ | 3,375,306 | 
 |   | $ | 11,412,533 | 
 |   | $ | 39,954,322 | 
 |  
|   |   |   |   |   |   |   |   |   |  
| Three months ended September 30, 2018 |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |  
| Revenue - external customers |   | $ | 6,478,864 | 
 |   | $ | 1,459,820 | 
 |   | $ | — | 
 |   | $ | 7,938,684 | 
 |  
| Intersegment revenue |   | 216,993 | 
 |   | — | 
 |   | (216,993 | ) |   | — | 
 |  
|    Total revenue |   | $ | 6,695,857 | 
 |   | $ | 1,459,820 | 
 |   | $ | (216,993 | ) |   | $ | 7,938,684 | 
 |  
| Gross profit |   | $ | 2,266,307 | 
 |   | $ | 616,791 | 
 |   | $ | — | 
 |   | $ | 2,883,098 | 
 |  
| Identifiable assets |   | $ | 21,311,668 | 
 |   | $ | 12,870,771 | 
 |   | $ | 16,579,095 | 
 |   | $ | 50,761,534 | 
 |  
|   |   |   |   |   |   |   |   |   |  | (1) Corporate, intersegment revenue, other and elimination includes various corporate assets.  |  |