Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Warranty Activity (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Warranty Activity [Abstract]
Balance at the beginning of the period	$ 140	$ 110	$ 159	$ 100
Accruals for warranties issued	23	27	39	58
Settlements made during the period (in cash or in kind)	(13)	(12)	(48)	(33)
Balance at the end of the period	$ 150	$ 125	$ 150	$ 125