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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Summary of information by segment
  For the year ended December 31, 2018 
   Machinery 
and 
Equipment sales		   Construction
materials sales		   Municipal 
construction projects		   Technological consulting 
and other services		   Total 
Revenues  $17,453,324   $18,805,539   $720,191   $590,808   $37,569,862 
Cost of goods sold   8,050,742    11,600,016    537,076    180,505    20,368,339 
Gross profit   9,402,582    7,205,523    183,115    410,303    17,201,523 
Interest expense and charges   478,515    583,123    329    3,320    1,065,287 
Depreciation and amortization   212,819    1,508,016    13,420    -    1,734,255 
Capital expenditures   242,077    9,033,608    -    -    9,275,685 
Income tax expenses   294,283    1,283,697    1,675    800    1,580,455 
Segment profit (loss)   2,687,222    3,613,721    (68,077)   (1,665,184)   4,567,682 
Segment assets as of December 31, 2018  $21,156,682   $59,083,126   $716,909   $893,878   $81,850,595 

 

   For the year ended December 31, 2017 
   Machinery 
and 
Equipment sales		   Construction 
materials sales		   Municipal 
construction projects		   Technological consulting 
and other services		   Total 
Revenues  $14,484,853   $19,455,800   $250,422   $1,359,941   $35,551,016 
Cost of goods sold   6,735,906    10,368,972    160,324    432,084    17,697,286 
Gross profit   7,748,947    9,086,828    90,098    927,857    17,853,730 
Interest expense and charges   410,214    601,141    370    1,235    1,012,960 
Depreciation and amortization   207,651    1,359,088    -    -    1,566,739 
Capital expenditures   107,577    4,500,485    30,941    -    4,639,003 
Income tax expenses   1,030,904    1,486,371    -    242,805    2,760,080 
Segment profit (loss)   3,335,076    4,395,629    (82,323)   (1,001,597)   6,646,785 
Segment assets as of December 31, 2017  $10,899,522   $60,000,714   $567,030   $9,664,563   $81,131,829 

  

   For the year ended December 31, 2016 
   Machinery and Equipment sales   Construction materials sales   Municipal construction projects   Technological consulting and other services   Total 
Revenues  $13,166,604   $18,424,613   $-   $833,052   $32,424,269 
Cost of goods sold   5,456,102    12,400,372    -    514,754    18,371,228 
Gross profit   7,710,502    6,024,241    -    318,298    14,053,041 
Interest expense and charges   650,727    795,833    282    3,547    1,450,389 
Depreciation and amortization   189,404    1,170,605    1,251    -    1,361,260 
Capital expenditures   87,267    9,284,800    -    -    9,372,067 
Income tax expenses   945,186    967,221    -    39,949    1,952,356 
Segment profit   3,125,268    2,830,950    (901,145)   (551,993)   4,503,080 
Segment assets as of December 31, 2016  $12,870,817   $47,829,971   $(186,139)  $2,146,350   $62,660,999