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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Warranty Activity [Abstract]
Balance at the beginning of the period	$ 68	$ 150	$ 75	$ 159
Accruals for warranties issued	32	7	48	46
Settlements made during the period (in cash or in kind)	(24)	(17)	(47)	(65)
Balance at the end of the period	$ 76	$ 140	$ 76	$ 140