Commitments and Contingencies - (Tables)

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies [Abstract]

Schedule of changes product warranty liability [Table Text Block]

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

	Three Months Ended March 31,
	2015		2014
Balance, beginning of the period	$	1,574	$	1,551
Accruals	822		481
Less: Usage	696		523
Balance, end of the period	$	1,700	$	1,509