7. OPERATING LEASES

12 Months Ended

Dec. 31, 2016

Leases, Operating [Abstract]

Operating Leases of Lessee Disclosure [Table Text Block]

7. OPERATING LEASES

We lease certain machinery, trucks, and facilities under operating leases that generally provide for renewal options. We incurred approximately $1,279,000, $1,335,000, and $1,324,000 in rent expense under operating lease arrangements for 2016, 2015 and 2014, respectively.

Future minimum lease payments under non-cancelable operating leases are approximately as follows for the years ended December 31:

2017	$	1,208,051
2018		712,690
2019		200,963
2020		78,383
2021		9,100
Total	$	2,209,187