Segment Information and Major Customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 customer segment	Sep. 30, 2011 customer	Sep. 30, 2010 customer
Segment Reporting Information [Line Items]
Number of operating segments									1
Number of reportable segments									1
Net sales	$ 47,248	$ 47,632	$ 49,016	$ 46,662	$ 51,836	$ 54,274	$ 49,716	$ 48,334	$ 190,558	$ 204,160	$ 182,548
Total property, equipment and improvements	15,157				15,370				15,157	15,370	16,396
Number of customer representing over ten percent of net sales									0	0	0
Non-embedded Products [Member]
Segment Reporting Information [Line Items]
Net sales									95,604	108,435	100,146
Embedded Products [Member]
Segment Reporting Information [Line Items]
Net sales									94,954	95,725	82,402
North America [Member]
Segment Reporting Information [Line Items]
Net sales									112,398	118,654	107,347
United States
Segment Reporting Information [Line Items]
Total property, equipment and improvements	14,233				14,169				14,233	14,169	15,015
United States | Exported Net Sales [Member]
Segment Reporting Information [Line Items]
Percentage of net sales									39.60%	37.50%	34.10%
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales									47,042	52,125	47,698
Asia Countries [Member]
Segment Reporting Information [Line Items]
Net sales									24,844	26,939	22,742
Latin America [Member]
Segment Reporting Information [Line Items]
Net sales									6,274	6,442	4,761
International, Primarily Europe [Member]
Segment Reporting Information [Line Items]
Total property, equipment and improvements	$ 924				$ 1,201				$ 924	$ 1,201	$ 1,381