Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 14,904	$ 13,873	$ 47,268	$ 41,584
Cost of sales	11,679	10,789	36,209	32,261
Gross profit	3,225	3,084	11,059	9,323
Operating expenses:
Sales and marketing	734	734	2,363	2,422
General and administrative	1,504	1,486	4,744	4,382
Research and development	1,243	1,326	3,513	3,600
Total operating expenses	3,481	3,546	10,620	10,404
Operating income (loss)	(256)	(462)	439	(1,081)
Interest expense	(210)	(144)	(588)	(431)
Equity in income (loss) of partnerships	(39)	(12)	(77)	317
Gain on sale of investment in partnership	822		822
Other income (expense)	(36)	69	(64)	32
Income (loss) before income taxes	281	(549)	532	(1,163)
Income tax expense (benefit)	64	(60)	155	(90)
Net income (loss)	$ 217	$ (489)	$ 377	$ (1,073)
Net income (loss) per share:
Basic	$ 0.04	$ (0.09)	$ 0.07	$ (0.19)
Diluted	$ 0.04	$ (0.09)	$ 0.06	$ (0.19)
Average shares outstanding:
Basic	5,674	5,600	5,666	5,576
Diluted	5,854	5,600	5,910	5,576