Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Warranty Activity (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Warranty Activity [Abstract]
Balance at the beginning of the period	$ 150	$ 125	$ 159	$ 100
Accruals for warranties issued	7	52	46	110
Settlements made during the period (in cash or in kind)	(17)	(18)	(65)	(51)
Balance at the end of the period	$ 140	$ 159	$ 140	$ 159