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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Warranty Activity [Abstract]
Balance at the beginning of the period	$ 75	$ 140	$ 75	$ 159
Accruals for warranties issued		23	16	39
Settlements made during the period (in cash or in kind)	(7)	(13)	(23)	(48)
Balance at the end of the period	$ 68	$ 150	$ 68	$ 150