Note 4 - Warranty Reserves (Details) - Warranty Reserves (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 Reserves [Abstract]
Warranty accrual at beginning of period	$ 456	$ 851	$ 662	$ 770
Charged to expense	78	91	166	280
Amounts written off, net of recoveries	(216)	(55)	(505)	(171)
Foreign currency adjustment	(2)	4	(7)	12
Warranty accrual at end of period	$ 316	$ 891	$ 316	$ 891