Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 15,841	$ 13,943	$ 32,365	$ 27,711
Cost of sales	12,163	10,784	24,530	21,472
Gross profit	3,678	3,159	7,835	6,239
Operating expenses:
Sales and marketing	754	885	1,629	1,688
General and administrative	1,613	1,492	3,239	2,896
Research and development	1,134	1,025	2,271	2,274
Total operating expenses	3,501	3,402	7,139	6,858
Operating income (loss)	177	(243)	696	(619)
Interest expense	(179)	(145)	(358)	(287)
Equity in income (loss) of partnerships	(14)	120	(38)	329
Other expense	(9)	(29)	(48)	(37)
Income (loss) before income taxes	(25)	(297)	252	(614)
Income tax expense (benefit)	57	(3)	91	(30)
Net income (loss)	$ (82)	$ (294)	$ 161	$ (584)
Net income (loss) per share:
Basic	$ (0.01)	$ (0.05)	$ 0.03	$ (0.10)
Diluted	$ (0.01)	$ (0.05)	$ 0.03	$ (0.10)
Average shares outstanding:
Basic	5,670	5,569	5,662	5,564
Diluted	5,670	5,569	5,939	5,564