17. Quarterly results of operations (unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	Quarter Ended
(In thousands, except per share amounts)	March 31		June 30		September 30		December 31
2013:
Net sales	$	15,057	$	15,788	$	16,768	$	12,528
Gross profit		6,433		6,452		7,206		5,001
Net income		1,160		1,215		1,451		1,109
Net income per share:
Basic		0.13		0.14		0.17		0.13
Diluted		0.13		0.14		0.17		0.13

2012:
Net sales	$	17,559	$	15,853	$	15,358	$	19,616
Gross profit		6,778		5,842		5,679		7,683
Net income		1,208		508		23		1,882
Net income per share:
Basic		0.13		0.06		0.00		0.21
Diluted		0.13		0.06		0.00		0.21