Commitments and Contingencies - (Tables)

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies [Abstract]

Schedule of changes product warranty liability [Table Text Block]

Changes in the Company’s warranty reserves are as follows:

	Six Months Ended June 30,
	2016		2015
Balance, beginning of the period	$	1,894	$	1,574
Accruals	1,261		1,300
Less: Usage	1,319		1,051
Balance, end of the period	$	1,836	$	1,823