Product segment and geographic information (Details) (USD $)	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Total sales	$ 11,930,378	$ 15,427,227
Video Recorder Products [Member]
Total sales	7,221,592	8,965,926
Tv Receiver Products [Member]
Total sales	4,432,415	6,190,210
Non Tv Receiver Products [Member]
Total sales	$ 276,371	$ 271,091

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration