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Segment Reporting (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 37,569,862 | $ 35,551,016 | $ 32,424,269
Cost of goods sold | 20,368,339 | 17,697,286 | 18,371,228
Gross profit | 17,201,523 | 17,853,730 | 14,053,041
Interest expense and charges | 1,065,287 | 1,012,960 | 1,450,389
Depreciation and amortization | 1,734,255 | 1,566,739 | 1,361,260
Capital expenditures | 9,275,685 | 4,639,003 | 9,372,067
Income tax expenses | 1,580,455 | 2,760,080 | 1,952,356
Segment profit (loss) | 4,567,682 | 6,646,785 | 4,503,080
Segment assets | 82,004,922 | 81,131,829 | 62,660,999
Machinery and Equipment sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 17,453,324 | 14,484,853 | 13,166,604
Cost of goods sold | 8,050,742 | 6,735,906 | 5,456,102
Gross profit | 9,402,582 | 7,748,947 | 7,710,502
Interest expense and charges | 478,515 | 410,214 | 650,727
Depreciation and amortization | 212,819 | 207,651 | 189,404
Capital expenditures | 242,077 | 107,577 | 87,267
Income tax expenses | 294,283 | 1,030,904 | 945,186
Segment profit (loss) | 2,687,222 | 3,335,076 | 3,125,268
Segment assets | 21,156,682 | 10,899,522 | 12,870,817
Construction materials sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 18,805,539 | 19,455,800 | 18,424,613
Cost of goods sold | 11,600,016 | 10,368,972 | 12,400,372
Gross profit | 7,205,523 | 9,086,828 | 6,024,241
Interest expense and charges | 583,123 | 601,141 | 795,833
Depreciation and amortization | 1,508,016 | 1,359,088 | 1,170,605
Capital expenditures | 9,033,608 | 4,500,485 | 9,284,800
Income tax expenses | 1,283,697 | 1,486,371 | 967,221
Segment profit (loss) | 3,613,721 | 4,395,629 | 2,830,950
Segment assets | 59,083,126 | 60,000,714 | 47,829,971
Municipal construction projects [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 720,191 | 250,422 |
Cost of goods sold | 537,076 | 160,324 |
Gross profit | 183,115 | 90,098 |
Interest expense and charges | 329 | 370 | 282
Depreciation and amortization | 13,420 |  | 1,251
Capital expenditures |  | 30,941 |
Income tax expenses | 1,675 |  |
Segment profit (loss) | (68,077) | (82,323) | (901,145)
Segment assets | 716,909 | 567,030 | (186,139)
Technological consulting and other services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 590,808 | 1,359,941 | 833,052
Cost of goods sold | 180,505 | 432,084 | 514,754
Gross profit | 410,303 | 927,857 | 318,298
Interest expense and charges | 3,320 | 1,235 | 3,547
Depreciation and amortization |  |  |
Capital expenditures |  |  |
Income tax expenses | 800 | 242,805 | 39,949
Segment profit (loss) | (1,665,184) | (1,001,597) | (551,993)
Segment assets | $ 893,878 | $ 9,664,563 | $ 2,146,350

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