Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 12,330	$ 13,828	$ 37,935	$ 44,124
Cost of sales	9,629	10,594	29,603	32,821
Gross profit	2,701	3,234	8,332	11,303
Operating expenses:
Sales and marketing	801	734	2,424	2,363
General and administrative	1,512	1,410	4,439	4,299
Research and development	519	1,138	2,997	3,299
Restructuring charges (note 3)			199
Total operating expenses	2,832	3,282	10,059	9,961
Operating income (loss)	(131)	(48)	(1,727)	1,342
Interest expense	(161)	(210)	(468)	(569)
Equity in (loss) of partnerships	(49)	(39)	(184)	(77)
Gain on sale of investment in partnership		822		822
Other income (expense)	30	(35)	113	(92)
Income (loss) from continuing operations before income taxes and discontinued operations	(311)	490	(2,266)	1,426
Income tax expense	121	64	159	155
Income (loss) before discontinued operations	(432)	426	(2,425)	1,271
Loss from discontinued operations, net of income taxes (note 4)	(393)	(209)	(2,314)	(894)
Net income (loss)	$ (825)	$ 217	$ (4,739)	$ 377
Basic income (loss) per share:
Continuing operations	$ (0.08)	$ 0.08	$ (0.43)	$ 0.22
Discontinued operations	$ (0.07)	$ (0.04)	$ (0.41)	$ (0.16)
Net income (loss) per share:	$ (0.14)	$ 0.04	$ (0.83)	$ 0.07
Diluted income (loss) per share:
Continuing operations	$ (0.08)	$ 0.07	$ (0.43)	$ 0.22
Discontinued operations	$ (0.07)	$ (0.04)	$ (0.41)	$ (0.15)
Net income (loss) per share:	$ (0.14)	$ 0.04	$ (0.83)	$ 0.06
Average shares outstanding:
Basic	5,702	5,674	5,694	5,666
Diluted	5,702	5,854	5,694	5,910