Property, Buildings and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Buildings and Equipment

Property, Buildings and Equipment

The following table presents the balances of major classes of properties as of December 31 as indicated:

	Estimated useful lives in years	2017		2016
Land	—	$	530,221	$	371,228
Land improvements	7 - 15	495,484		470,754
Buildings and improvements	5 - 40	2,588,053		2,155,578
Leasehold improvements	7 - 39	252,646		252,646
Machinery and equipment	2 - 10	70,892,181		62,955,883
Construction in progress	—	241,369		180,072
Total		74,999,954		66,386,161
Less accumulated depreciation		38,927,654		33,140,214
Net properties, buildings and equipment		$	36,072,300	$	33,245,947

Management reviews the net carrying value of all properties, buildings and equipment on a regular basis to assess and determine whether trigger events of impairment exist and the need for possible impairments. As a result of such review, no impairment write-down was considered necessary for the years ended December 31, 2017 and 2016.