Revolving Line of Credit (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Debt covenants [Table Text Block]

Quarterly Financial Covenants	Requirement	Actual
EBITDA to fixed charges ratio	1.10 : 1.00	1.75 : 1.00
Minimum tangible net worth	$45.0 million	$48.6 million