Note 8 - Accrued Warranty (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Product Warranty Accrual, Warranties Issued	$ 64,000	$ 156,000
Product Warranty Accrual, Payments		$ 13,000

Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Name:	us-gaap_ProductWarrantyAccrualWarrantiesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration