Note 2 - Summary of Significant Accounting Policies (Detail) - Warranty Activity (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Balance at the beginning of the period	$ 125	$ 100	$ 100	$ 126
Accruals for warranties issued	52	23	110	45
Settlements made during the period (in cash or in kind)	(18)	(23)	(51)	(71)
Balance at the end of the period	$ 159	$ 100	$ 159	$ 100