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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